Redis集群搭建(主从模式、哨兵模式、集群模式)
作者：242030
本文主要介绍了Redis集群搭建,主要包括主从模式、哨兵模式、集群模式这三种方式,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧
1、主从模式部署
1.1 环境准备
| IP | 主机名 | 角色 |
|---|---|---|
| 192.168.54.200 | master | master |
| 192.168.54.201 | slave1 | slave1 |
| 192.168.54.202 | slave2 | slave2 |
1.2 下载
下载地址：http://download.redis.io/releases/
这里选择下载：redis-7.0.3.tar.gz
1.3 上传到服务器并且解压(所有节点)
# 解压 tar -xf redis-7.0.3.tar.gz cd redis-7.0.3 # 设置环境变量 echo "export REDIS_HOME=/home/zhangshixing/redis/redis-7.0.3">> /etc/profile source /etc/profile
1.4 编译安装(所有节点)
cd $REDIS_HOME yum -y install gcc gcc++ make && make install # 默认安装目录 /usr/local/bin
1.5 配置成服务(所有节点)
cat << EOF > /usr/lib/systemd/system/redis.service [Unit] Description=Redis persistent key-value database After=network.target After=network-online.target Wants=network-online.target [Service] ExecStart=/usr/local/bin/redis-server /usr/local/redis/redis.conf --supervised systemd ExecStop=/usr/libexec/redis-shutdown Type=forking User=redis Group=redis RuntimeDirectory=redis RuntimeDirectoryMode=0755 LimitNOFILE=65536 PrivateTmp=true [Install] WantedBy=multi-user.target EOF
配置描述：
Description: # 描述服务 After: # 描述服务类别 [Service]: # 服务运行参数的设置 Type=forking: # 是后台运行的形式 ExecStart: # 为服务的具体运行命令 ExecReload: # 为重启命令 ExecStop: # 为停止命令 LimitNOFILE=65536: # 打开文件数和进程数有限制,默认限制为1024,如果不设置,或者设置为LimitNOFILE=unlimited(不识别),则得到了1024 PrivateTmp=True: # 表示给服务分配独立的临时空间 #【注意】[Service]的启动、重启、停止命令全部要求使用绝对路径 [Install]: # 运行级别下服务安装的相关设置,可设置为多用户,即系统运行级别为3
# 重载系统服务 systemctl daemon-reload
/usr/libexec/redis-shutdown的内容：
#!/bin/bash
#
# Wrapper to close properly redis and sentinel
test x"$REDIS_DEBUG" != x && set -x
REDIS_CLI=/usr/local/bin/redis-cli
# Retrieve service name
SERVICE_NAME="$1"
if [ -z "$SERVICE_NAME" ]; then
SERVICE_NAME=redis
fi
# Get the proper config file based on service name
CONFIG_FILE="/usr/local/redis/$SERVICE_NAME.conf"
# Use awk to retrieve host, port from config file
HOST=`awk '/^[[:blank:]]*bind/ { print $2 }' $CONFIG_FILE | tail -n1`
PORT=`awk '/^[[:blank:]]*port/ { print $2 }' $CONFIG_FILE | tail -n1`
PASS=`awk '/^[[:blank:]]*requirepass/ { print $2 }' $CONFIG_FILE | tail -n1`
SOCK=`awk '/^[[:blank:]]*unixsocket\s/ { print $2 }' $CONFIG_FILE | tail -n1`
# Just in case, use default host, port
HOST=${HOST:-127.0.0.1}
if [ "$SERVICE_NAME" = redis ]; then
PORT=${PORT:-6379}
else
PORT=${PORT:-26739}
fi
# Setup additional parameters
# e.g password-protected redis instances
[ -z "$PASS" ] || ADDITIONAL_PARAMS="-a $PASS"
# shutdown the service properly
if [ -e "$SOCK" ] ; then
$REDIS_CLI -s $SOCK $ADDITIONAL_PARAMS shutdown
else
$REDIS_CLI -h $HOST -p $PORT $ADDITIONAL_PARAMS shutdown
fi
配置完就可以通过systemctl启停redis了。
1.6 授权启动服务(所有节点)
chmod +x /usr/libexec/redis-shutdown useradd -s /sbin/nologin redis mkdir /usr/local/redis ; cp $REDIS_HOME/redis.conf /usr/local/redis/ && chown -R redis:redis /usr/local/redis mkdir -p /opt/software/redis-7.0.3/data && chown -R redis:redis /opt/software/redis-7.0.3/data # 命令补全 yum install -y bash-completion && source /etc/profile systemctl daemon-reload systemctl enable redis
1.7 修改linux内核参数(所有节点)
# 临时生效 sysctl -w vm.overcommit_memory=1 # 永久生效 echo 'vm.overcommit_memory=1' >> /etc/sysctl.conf && sysctl -p # 可选值：0,1,2。 # 0: 表示内核将检查是否有足够的可用内存供应用进程使用;如果有足够的可用内存,内存申请允许;否则,内存申请失败,并把错误返回给应用进程。 # 1: 表示内核允许分配所有的物理内存,而不管当前的内存状态如何。 # 2: 表示内核允许分配超过所有物理内存和交换空间总和的内存。
1.8 配置(redis.conf)
1.8.1 master节点配置
修改配置如下：
vi /usr/local/redis/redis.conf
bind 192.168.54.200 # 监听ip,多个ip用空格分隔 daemonize yes # 允许后台启动 logfile "/usr/local/redis/redis.log" # 日志路径 dir /opt/software/redis-7.0.3/data # 数据库备份文件存放目录 masterauth 123456 # slave连接master密码,master可省略 requirepass 123456 # 设置master连接密码,slave可省略 appendonly yes # 在/opt/software/redis-7.0.3/data目录生成appendonly.aof文件，将每一次写操作请求都追加到appendonly.aof 文件中
1.8.2 slave1节点配置
修改配置如下：
vi /usr/local/redis/redis.conf
bind 192.168.182.201 # 监听ip,多个ip用空格分隔 daemonize yes # 允许后台启动 logfile "/usr/local/redis/redis.log" # 日志路径 dir /opt/software/redis-7.0.3/data # 数据库备份文件存放目录 # replicaof用于追随某个节点的redis,被追随的节点为主节点,追随的为从节点,就是设置master节点 replicaof 192.168.182.200 6379 masterauth 123456 # slave连接master密码，master可省略 requirepass 123456 # 设置master连接密码，slave可省略 appendonly yes # 在/opt/software/redis-7.0.3/data目录生成appendonly.aof文件，将每一次写操作请求都追加到appendonly.aof 文件中
1.8.3 slave2节点配置
修改配置如下：
vi /usr/local/redis/redis.conf
bind 192.168.182.202 # 监听ip，多个ip用空格分隔 daemonize yes # 允许后台启动 logfile "/usr/local/redis/redis.log" # 日志路径 dir /opt/software/redis-7.0.3/data # 数据库备份文件存放目录 # replicaof用于追随某个节点的redis,被追随的节点为主节点,追随的为从节点,就是设置master节点 replicaof 192.168.182.200 6379 masterauth 123456 # slave连接master密码，master可省略 requirepass 123456 # 设置master连接密码，slave可省略 appendonly yes # 在/opt/software/redis-7.0.3/data目录生成appendonly.aof文件，将每一次写操作请求都追加到appendonly.aof 文件中
1.9 启动Redis服务(所有节点)
systemctl start redis systemctl status redis
1.10 查看集群状态
# 交互式 [root@master redis]# redis-cli -h 192.168.54.200 -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.54.200:6379> info replication # Replication role:master connected_slaves:2 slave0:ip=192.168.54.201,port=6379,state=online,offset=1204,lag=0 slave1:ip=192.168.54.202,port=6379,state=online,offset=1204,lag=1 master_failover_state:no-failover master_replid:e85f46b61089c38974769a2faa2fb905d4efc66f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:1204 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:1204
# 非交互式 [root@master redis]# redis-cli -h 192.168.54.200 -a 123456 info replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:master connected_slaves:2 slave0:ip=192.168.54.201,port=6379,state=online,offset=1288,lag=1 slave1:ip=192.168.54.202,port=6379,state=online,offset=1288,lag=1 master_failover_state:no-failover master_replid:e85f46b61089c38974769a2faa2fb905d4efc66f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:1288 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:1288
# 交互式 [root@master redis]# redis-cli -h 192.168.54.200 -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.54.200:6379> auth 123456 OK 192.168.54.200:6379> info replication # Replication role:master connected_slaves:2 slave0:ip=192.168.54.201,port=6379,state=online,offset=1372,lag=1 slave1:ip=192.168.54.202,port=6379,state=online,offset=1372,lag=1 master_failover_state:no-failover master_replid:e85f46b61089c38974769a2faa2fb905d4efc66f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:1372 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:1372
在这里Redis的主从模式就部署完了（一主两从）。
2、Sentinel(哨兵)模式部署
2.1 环境准备
| IP | 主机名 | 角色 |
|---|---|---|
| 192.168.54.200 | master | master,Sentinel |
| 192.168.54.201 | slave1 | slave1,Sentinel |
| 192.168.54.202 | slave2 | slave2,Sentinel |
【温馨提示】 sentinel 最好跟redis部署在不同的机器上，sentinel 端口：26379。
2.2 配置sentinel(所有节点)
【温馨提示】前面已经安装过了redis主从模式了，因为哨兵模式是基于主从模式的，所以redis的配置这里就省略
了，直接修改sentinel配置文件，配置3个哨兵，每个哨兵的配置都是一样的。
# 三个节点创建存储目录 mkdir /opt/software/redis-7.0.3/sentinel; chown -R redis:redis /opt/software/redis-7.0.3/sentinel cat >/usr/local/redis/sentinel.conf<<EOF daemonize yes logfile "/usr/local/redis/sentinel.log" # sentinel工作目录 dir "/opt/software/redis-7.0.3/sentinel" # 判断master失效至少需要2个sentinel同意，建议设置为n/2+1,n为sentinel个数 # sentinel monitor <master-name> <ip> <port> <count> sentinel monitor mymaster 192.168.54.200 6379 2 sentinel auth-pass mymaster 123456 # 判断master主观下线时间，默认30s sentinel down-after-milliseconds mymaster 30000 EOF
2.3 启动sentinel(所有节点)
nohup /usr/local/bin/redis-sentinel /usr/local/redis/sentinel.conf >> nohup.out 2>&1 & netstat -tnlp|grep 26379
2.4 模拟故障测试
# 停掉master systemctl stop redis redis-cli -h 192.168.54.201 -a 123456 info replication
[root@master redis]# redis-cli -h 192.168.54.201 -a 123456 info replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:slave master_host:192.168.54.200 master_port:6379 master_link_status:down master_last_io_seconds_ago:-1 master_sync_in_progress:0 slave_read_repl_offset:20712 slave_repl_offset:20712 master_link_down_since_seconds:18 slave_priority:100 slave_read_only:1 replica_announced:1 connected_slaves:0 master_failover_state:no-failover master_replid:e85f46b61089c38974769a2faa2fb905d4efc66f master_replid2:0000000000000000000000000000000000000000 master_repl_offset:20712 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:20712
[root@master redis]# redis-cli -h 192.168.54.201 -a 123456 info replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:slave master_host:192.168.54.202 master_port:6379 master_link_status:up master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_read_repl_offset:29371 slave_repl_offset:29371 slave_priority:100 slave_read_only:1 replica_announced:1 connected_slaves:0 master_failover_state:no-failover master_replid:7a7fe0a8528e0c7913d5d54bc5ba633ab6879a8c master_replid2:e85f46b61089c38974769a2faa2fb905d4efc66f master_repl_offset:29371 second_repl_offset:20713 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:29371
发现master节点已经切换到其它节点了，再测试一下读写：
[root@master redis]# redis-cli -h 192.168.54.202 -a 123456 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 192.168.54.202:6379> set k2 v2 OK
新的master节点写能力也正常，接下来就是恢复故障了。
# 启动master systemctl start redis redis-cli -h 192.168.54.202 -a 123456 info replication
[root@master redis]# redis-cli -h 192.168.54.202 -a 123456 info replication Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. # Replication role:master connected_slaves:2 slave0:ip=192.168.54.201,port=6379,state=online,offset=70444,lag=0 slave1:ip=192.168.54.200,port=6379,state=online,offset=70444,lag=0 master_failover_state:no-failover master_replid:7a7fe0a8528e0c7913d5d54bc5ba633ab6879a8c master_replid2:e85f46b61089c38974769a2faa2fb905d4efc66f master_repl_offset:70587 second_repl_offset:20713 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:869 repl_backlog_histlen:69719
发现就算原先的master节点恢复了，也不会切换到master角色，而是作为slave角色。
3、Cluster模式部署
使用集群，只需要将redis配置文件中的cluster-enable配置打开即可。
3.1 环境准备
| IP | 端口 | 节点 |
|---|---|---|
| 192.168.54.200 | 7001,7002,7003 | node1 |
| 192.168.54.201 | 7001,7002,7003 | node2 |
| 192.168.54.202 | 7001,7002,7003 | node3 |
3.2 修改配置(所有节点)
【温馨提示】这里是基于主从模式的配置修改，不是基于主从模式部署，哨兵模式是基于主从模式部署。
# 创建存储目录
mkdir -p /opt/software/redis-7.0.3/cluster/redis_{7001..7003}
cp /usr/local/redis/redis.conf /usr/local/redis/cluster_redis_7001.conf
cp /usr/local/redis/redis.conf /usr/local/redis/cluster_redis_7002.conf
cp /usr/local/redis/redis.conf /usr/local/redis/cluster_redis_7003.conf
chown -R redis:redis /usr/local/redis ;chown -R redis:redis /opt/software/redis-7.0.3/cluster
修改配置文件/usr/local/redis/cluster_redis_7001.conf
# 【注意】节点不一样，IP不一样，记得修改这个bind配置 bind 192.168.54.200 port 7001 daemonize yes pidfile "/var/run/cluster_redis_7001.pid" logfile "/usr/local/redis/cluster_redis_7001.log" dir "/opt/software/redis-7.0.3/cluster/redis_7001" masterauth "123456" requirepass "123456" # replicaof 192.168.54.202 6379 appendonly yes # 开启集群模式 cluster-enabled yes # 虽然此配置的名字叫"集群配置文件"，但是此配置文件不能人工编辑，它是集群节点自动维护的文件，主要用于记录集群中有哪些节点、他们的状态以及一些持久化参数等，方便在重启时恢复这些状态。通常是在收到请求之后这个文件就会被更新。 cluster-config-file nodes_7001.conf cluster-node-timeout 15000
修改配置文件/usr/local/redis/cluster_redis_7002.conf
# 【注意】节点不一样，IP不一样，记得修改这个bind配置 bind 192.168.54.200 port 7002 daemonize yes pidfile "/var/run/cluster_redis_7002.pid" logfile "/usr/local/redis/cluster_redis_7002.log" dir "/opt/software/redis-7.0.3/cluster/redis_7002" masterauth "123456" requirepass "123456" # replicaof 192.168.54.202 6379 appendonly yes # 配置yes则开启集群功能，此redis实例作为集群的一个节点，否则，它是一个普通的单一的redis实例。 cluster-enabled yes # 虽然此配置的名字叫"集群配置文件"，但是此配置文件不能人工编辑，它是集群节点自动维护的文件，主要用于记录集群中有哪些节点、他们的状态以及一些持久化参数等，方便在重启时恢复这些状态。通常是在收到请求之后这个文件就会被更新。 cluster-config-file nodes_7002.conf cluster-node-timeout 15000
修改配置文件/usr/local/redis/cluster_redis_7002.conf
# 【注意】节点不一样，IP不一样，记得修改这个bind配置 bind 192.168.54.200 port 7003 daemonize yes pidfile "/var/run/cluster_redis_7003.pid" logfile "/usr/local/redis/cluster_redis_7003.log" dir "/opt/software/redis-7.0.3/cluster/redis_7003" masterauth "123456" requirepass "123456" # replicaof 192.168.54.202 6379 appendonly yes # 配置yes则开启集群功能，此redis实例作为集群的一个节点，否则，它是一个普通的单一的redis实例。 cluster-enabled yes # 虽然此配置的名字叫"集群配置文件"，但是此配置文件不能人工编辑，它是集群节点自动维护的文件，主要用于记录集群中有哪些节点、他们的状态以及一些持久化参数等，方便在重启时恢复这些状态。通常是在收到请求之后这个文件就会被更新。 cluster-config-file nodes_7003.conf cluster-node-timeout 15000
其它两台机器配置与192.168.54.2000一致，只是ip不同，此处省略。
# 将配置copy到另外两个节点
scp -r /usr/local/redis/cluster_redis_{7001..7003}.conf 192.168.54.201:/usr/local/redis/
scp -r /usr/local/redis/cluster_redis_{7001..7003}.conf 192.168.54.202:/usr/local/redis/
# 在node2上执行
sed -i 's/192.168.54.200/192.168.54.201/g' /usr/local/redis/cluster_redis_{7001..7003}.conf
# 在node3上执行
sed -i 's/192.168.54.200/192.168.54.202/g' /usr/local/redis/cluster_redis_{7001..7003}.conf
3.3 启动Redis服务(所有节点)
nohup redis-server /usr/local/redis/cluster_redis_7001.conf >> nohup.out 2>&1 & netstat -tnlp|grep 7001 nohup redis-server /usr/local/redis/cluster_redis_7002.conf >> nohup.out 2>&1 & netstat -tnlp|grep 7002 nohup redis-server /usr/local/redis/cluster_redis_7003.conf >> nohup.out 2>&1 & netstat -tnlp|grep 7003 tail -f /usr/local/redis/cluster_redis_7001.log tail -f /usr/local/redis/cluster_redis_7002.log tail -f /usr/local/redis/cluster_redis_7003.log
3.4 创建集群
# --cluster-replicas 2 : 表示集群的一个主节点有2个从节点，就是一主两从模式 # 如果不加--cluster-replicas 2则会创建9个主节点 # --cluster / -c 告知redis-cli命令行工具，后续操作为cluster模式下 # --create 表示创建cluster模式 redis-cli -a 123456 --cluster create \ 192.168.54.200:7001 192.168.54.200:7002 192.168.54.200:7003 \ 192.168.54.201:7001 192.168.54.201:7002 192.168.54.201:7003 \ 192.168.54.202:7001 192.168.54.202:7002 192.168.54.202:7003 \ --cluster-replicas 2
[root@master redis]# redis-cli -a 123456 --cluster create \ > 192.168.54.200:7001 192.168.54.200:7002 192.168.54.200:7003 \ > 192.168.54.201:7001 192.168.54.201:7002 192.168.54.201:7003 \ > 192.168.54.202:7001 192.168.54.202:7002 192.168.54.202:7003 \ > --cluster-replicas 2 Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. >>> Performing hash slots allocation on 9 nodes... Master[0] -> Slots 0 - 5460 Master[1] -> Slots 5461 - 10922 Master[2] -> Slots 10923 - 16383 Adding replica 192.168.54.201:7002 to 192.168.54.200:7001 Adding replica 192.168.54.202:7002 to 192.168.54.200:7001 Adding replica 192.168.54.200:7003 to 192.168.54.201:7001 Adding replica 192.168.54.202:7003 to 192.168.54.201:7001 Adding replica 192.168.54.201:7003 to 192.168.54.202:7001 Adding replica 192.168.54.200:7002 to 192.168.54.202:7001 M: d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001 slots:[0-5460] (5461 slots) master S: 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002 replicates 41d651cdefd81e8b2249cf9a99d151920a2e793e S: 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003 replicates 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 M: 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001 slots:[5461-10922] (5462 slots) master S: 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002 replicates d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 S: 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003 replicates 41d651cdefd81e8b2249cf9a99d151920a2e793e M: 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001 slots:[10923-16383] (5461 slots) master S: ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002 replicates d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 S: bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003 replicates 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 Can I set the above configuration? (type 'yes' to accept): yes >>> Nodes configuration updated >>> Assign a different config epoch to each node >>> Sending CLUSTER MEET messages to join the cluster Waiting for the cluster to join . >>> Performing Cluster Check (using node 192.168.54.200:7001) M: d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001 slots:[0-5460] (5461 slots) master 2 additional replica(s) S: 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002 slots: (0 slots) slave replicates d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 S: 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003 slots: (0 slots) slave replicates 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 S: bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003 slots: (0 slots) slave replicates 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 M: 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001 slots:[5461-10922] (5462 slots) master 2 additional replica(s) M: 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001 slots:[10923-16383] (5461 slots) master 2 additional replica(s) S: 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003 slots: (0 slots) slave replicates 41d651cdefd81e8b2249cf9a99d151920a2e793e S: 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002 slots: (0 slots) slave replicates 41d651cdefd81e8b2249cf9a99d151920a2e793e S: ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002 slots: (0 slots) slave replicates d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
会自动生成nodes.conf文件
[root@master redis]# ll /opt/software/redis-7.0.3/cluster/redis_{7001..7003}
/opt/software/redis-7.0.3/cluster/redis_7001:
总用量 4
drwxr-xr-x. 2 root root 103 12月 20 16:48 appendonlydir
-rw-r--r--. 1 root root 1237 12月 20 16:49 nodes_7001.conf
/opt/software/redis-7.0.3/cluster/redis_7002:
总用量 8
drwxr-xr-x. 2 root root 103 12月 20 16:49 appendonlydir
-rw-r--r--. 1 root root 171 12月 20 16:49 dump.rdb
-rw-r--r--. 1 root root 1237 12月 20 16:49 nodes_7002.conf
/opt/software/redis-7.0.3/cluster/redis_7003:
总用量 8
drwxr-xr-x. 2 root root 103 12月 20 16:49 appendonlydir
-rw-r--r--. 1 root root 171 12月 20 16:49 dump.rdb
-rw-r--r--. 1 root root 1237 12月 20 16:49 nodes.conf
3.5 集群操作
3.5.1 登录集群
redis-cli -c -h 192.168.54.200 -p 7001
3.5.2 查看集群信息
> auth 123456 > CLUSTER INFO
3.5.3 列出节点信息
> CLUSTER NODES
[root@master redis]# redis-cli -c -h 192.168.54.200 -p 7001 192.168.54.200:7001> auth 123456 OK 192.168.54.200:7001> CLUSTER INFO cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:9 cluster_size:3 cluster_current_epoch:9 cluster_my_epoch:1 cluster_stats_messages_ping_sent:233 cluster_stats_messages_pong_sent:247 cluster_stats_messages_sent:480 cluster_stats_messages_ping_received:239 cluster_stats_messages_pong_received:233 cluster_stats_messages_meet_received:8 cluster_stats_messages_received:480 total_cluster_links_buffer_limit_exceeded:0 192.168.54.200:7001> CLUSTER NODES 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671526417098 1 connected d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671526415000 1 connected 0-5460 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671526419115 4 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671526418107 4 connected 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671526417000 4 connected 5461-10922 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671526418000 7 connected 10923-16383 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671526419000 7 connected 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671526418000 7 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671526416000 1 connected 192.168.54.200:7001>
3.5.4 增加节点
node1上增加一节点
【1】配置
# copy配置 cp /usr/local/redis/cluster_redis_7003.conf /usr/local/redis/cluster_redis_7004.conf # 创建存储目录 mkdir /opt/software/redis-7.0.3/cluster/redis_7004 # 修改配置 vi /usr/local/redis/cluster_redis_7004.conf bind 192.168.54.200 port 7004 daemonize yes pidfile "/var/run/redis_7004.pid" logfile "/usr/local/redis/cluster_redis_7004.log" dir "/opt/software/redis-7.0.3/cluster/redis_7004" #replicaof 192.168.182.110 6379 masterauth "123456" requirepass "123456" appendonly yes cluster-enabled yes cluster-config-file nodes_7004.conf cluster-node-timeout 15000 # 授权 chown -R redis:redis /usr/local/redis && chown -R redis:redis /opt/software/redis-7.0.3/cluster/redis_7004
【2】启动服务
nohup redis-server /usr/local/redis/cluster_redis_7004.conf >> nohup.out 2>&1 & netstat -tnlp|grep 7004
【3】集群中增加节点
[root@local-168-182-110 ~]# redis-cli -c -h 192.168.54.200 -p 7001 > auth 123456 # 添加节点 > CLUSTER MEET 192.168.54.200 7004 # 查看节点信息 > CLUSTER NODES
[root@master redis]# redis-cli -c -h 192.168.54.200 -p 7001 192.168.54.200:7001> auth 123456 OK 192.168.54.200:7001> CLUSTER MEET 192.168.54.200 7004 OK 192.168.54.200:7001> CLUSTER NODES a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 master - 0 1671527132044 0 connected 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527134063 1 connected d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671527131000 1 connected 0-5460 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527132000 4 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527132000 4 connected 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527133000 4 connected 5461-10922 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527133567 7 connected 10923-16383 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527132000 7 connected 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527133051 7 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527131000 1 connected
可以看到，新增的节点都是以master身份加入集群的
【4】更换节点身份
将新增的192.168.54.200:7004节点身份改为192.168.54.200:7001的slave：
redis-cli -c -h 192.168.54.200 -p 7004 > auth 123456 # 改变节点类型 > cluster replicate d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 > CLUSTER NODES
[root@master redis]# redis-cli -c -h 192.168.54.200 -p 7004 192.168.54.200:7004> auth 123456 OK 192.168.54.200:7004> CLUSTER NODES 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527454000 1 connected 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527451000 7 connected 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527452371 4 connected 5461-10922 d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 master - 0 1671527455399 1 connected 0-5460 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527454000 7 connected 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527453000 7 connected 10923-16383 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527453883 4 connected a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 myself,master - 0 1671527448000 0 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527451000 4 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527455000 1 connected 192.168.54.200:7004> cluster replicate d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 OK 192.168.54.200:7004> CLUSTER NODES 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527488000 1 connected 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527490723 7 connected 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527489000 4 connected 5461-10922 d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 master - 0 1671527489713 1 connected 0-5460 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527486675 7 connected 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527489598 7 connected 10923-16383 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527487000 4 connected a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 myself,slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527486000 1 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527487683 4 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527488691 1 connected
3.5.5 删除节点
redis-cli -c -h 192.168.54.200 -p 7001 > auth 123456 # 查看节点 > CLUSTER NODES # 删除节点 > CLUSTER FORGET a9b489648b4acc38bfc04499767f808b7208cb1f # 检查节点信息 > CLUSTER NODES
[root@master redis]# redis-cli -c -h 192.168.54.200 -p 7001 192.168.54.200:7001> auth 123456 OK 192.168.54.200:7001> CLUSTER NODES a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527601411 1 connected 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527598000 1 connected d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671527595000 1 connected 0-5460 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527600403 4 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527599000 4 connected 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527599393 4 connected 5461-10922 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527598000 7 connected 10923-16383 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527597374 7 connected 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527597000 7 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527600000 1 connected 192.168.54.200:7001> CLUSTER FORGET a9b489648b4acc38bfc04499767f808b7208cb1f OK 192.168.54.200:7001> 192.168.54.200:7001> CLUSTER NODES 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527636743 1 connected d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671527636000 1 connected 0-5460 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527635733 4 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527637753 4 connected 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527635000 4 connected 5461-10922 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527632000 7 connected 10923-16383 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527634724 7 connected 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527635000 7 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527632206 1 connected
3.5.6 保存配置
redis-cli -c -h 192.168.54.200 -p 7001 > auth 123456 # 将节点的配置文件保存到硬盘里面 > CLUSTER SAVECONFIG > CLUSTER NODES
[root@master redis]# redis-cli -c -h 192.168.54.200 -p 7001 192.168.54.200:7001> auth 123456 OK 192.168.54.200:7001> CLUSTER SAVECONFIG OK 192.168.54.200:7001> CLUSTER NODES a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527763975 1 connected 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527763000 1 connected d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671527762000 1 connected 0-5460 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527760000 4 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527759929 4 connected 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527759000 4 connected 5461-10922 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527761000 7 connected 10923-16383 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527762964 7 connected 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527762000 7 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527761956 1 connected
可以看到，之前删除的节点又恢复了，这是因为对应的配置文件没有删除，执行CLUSTER SAVECONFIG恢复。
3.5.7 模拟master节点挂掉
netstat -lntp |grep :7001|awk '{print $NF}'|cut -d '/' -f 1|xargs kill -9
redis-cli -c -h 192.168.54.201 -p 7001 -a 123456 CLUSTER NODES
[root@master redis]# redis-cli -c -h 192.168.54.201 -p 7001 -a 123456 CLUSTER NODES Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671528090000 7 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671528090000 4 connected d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 master,fail - 1671528024512 1671528017000 1 disconnected 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671528094858 7 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528093000 10 connected 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528093843 10 connected 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671528091000 7 connected 10923-16383 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 myself,master - 0 1671528093000 4 connected 5461-10922 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671528092000 4 connected a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 master - 0 1671528092000 10 connected 0-5460
对应192.168.54.200:7001的一行可以看到，master fail，状态为disconnected；而对应
192.168.54.200:7004的一行，slave已经变成master。
【故障恢复】重新启动192.168.54.200:7001节点
nohup redis-server /usr/local/redis/cluster_redis_7001.conf >> nohup.out 2>&1 & redis-cli -c -h 192.168.54.201 -p 7001 -a 123456 CLUSTER NODES
[root@master redis]# redis-cli -c -h 192.168.54.201 -p 7001 -a 123456 CLUSTER NODES Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe. 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671528205550 7 connected bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671528206457 4 connected d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528206000 10 connected 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671528206000 7 connected ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528208475 10 connected 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528206000 10 connected 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671528206558 7 connected 10923-16383 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 myself,master - 0 1671528205000 4 connected 5461-10922 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671528207466 4 connected a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 master - 0 1671528206000 10 connected 0-5460
可以看到，192.168.54.200:7001节点启动后为slave节点，并且是192.168.54.200:7004的slave节点。即
master节点如果挂掉，它的slave节点变为新master节点继续对外提供服务，而原来的master节点如果重启，则
变为新master节点的slave节点。
【温馨提示】cluster不能选择db，只能默认db为0，所以select切库相当于是不能使用的。
4、简单使用
4.1 集群常用操作
4.1.1 查看集群信息
# 打印集群的信息 cluster info # 列出集群当前已知的所有节点(node),以及这些节点的相关信息 cluster nodes
4.1.2 节点操作
# 将ip和port所指定的节点添加到集群当中,让它成为集群的一份子 cluster meet <ip> <port> # 从集群中移除node_id指定的节点 cluster forget <node_id> # 将当前节点设置为node_id指定的节点的从节点 cluster replicate <node_id> # 将节点的配置文件保存到硬盘里面 cluster saveconfig
4.1.3 槽(slot)
# 将一个或多个槽(slot)指派(assign)给当前节点 cluster addslots <slot> [slot ...] # 移除一个或多个槽对当前节点的指派 cluster delslots <slot> [slot ...] # 移除指派给当前节点的所有槽,让当前节点变成一个没有指派任何槽的节点 cluster flushslots # 将槽slot指派给node_id指定的节点,如果槽已经指派给另一个节点 # 那么先让另一个节点删除该槽,然后再进行指派 cluster setslot <slot> node <node_id> # 将本节点的槽slot迁移到node_id指定的节点中 cluster setslot <slot> migrating <node_id> # 从node_id指定的节点中导入槽slot到本节点 cluster setslot <slot> importing <node_id> # 取消对槽slot的导入(import)或者迁移(migrate) cluster setslot <slot> stable
4.1.4 键
# 计算键key应该被放置在哪个槽上 cluster keyslot <key> # 返回槽slot目前包含的键值对数量 cluster countkeysinslot <slot> # 返回count个slot槽中的键 cluster getkeysinslot <slot> <count>
4.2 redis 常用操作
4.2.1 字符串(String)
# 登录master节点，slave节点是只读的 redis-cli -c -h 192.168.182.112 -p 7001 192.168.182.112:7001> auth 123456 OK 192.168.182.112:7001> set k1 v1 OK 192.168.182.112:7001> get k1 "v1" # 获取多个值 192.168.182.112:7001> mget k1 k2 k3 1) "v1" 2) "v2" 3) "v3"
4.2.2 哈希(Hash)
Redis hash 是一个 string 类型的 field（字段） 和 value（值） 的映射表，hash 特别适合用于存储对象。
# 登录master节点，slave节点是只读的 redis-cli -c -h 192.168.182.112 -p 7001 192.168.182.112:7001> auth 123456 # 设置 192.168.182.112:7001> HSET myhash field1 "foo" (integer) 1 # 获取 192.168.182.112:7001> hget myhash field1 "foo"
4.2.3 列表(List)
Redis列表是简单的字符串列表，按照插入顺序排序。你可以添加一个元素到列表的头部（左边）或者尾部（右
边）。
# 登录master节点,slave节点是只读的 redis-cli -c -h 192.168.182.112 -p 7001 192.168.182.112:7001> auth 123456 192.168.182.112:7001> LPUSH larr v1 (integer) 1 192.168.182.112:7001> LPUSH larr v2 (integer) 2 192.168.182.112:7001> LPUSH larr v3 (integer) 3 # 获取0到10个元素 192.168.182.112:7001> LRANGE larr 0 10 1) "v3" 2) "v2" 3) "v1"
4.2.4 集合(Set)
Redis 的 Set 是 String 类型的无序集合。集合成员是唯一的，这就意味着集合中不能出现重复的数据。
# 登录master节点,slave节点是只读的 redis-cli -c -h 192.168.182.112 -p 7001 192.168.182.112:7001> auth 123456 192.168.182.112:7001> SADD myset "hello" (integer) 1 192.168.182.112:7001> SADD myset "foo" (integer) 1 # 已经存在,则不能添加该元素 192.168.182.112:7001> SADD myset "hello" (integer) 0 # 获取 192.168.182.112:7001> SMEMBERS myset 1) "foo" 2) "hello" 192.168.182.112:6379>
4.2.5 有序集合(sorted set)
Redis 有序集合和集合一样也是 string 类型元素的集合，且不允许重复的成员。不同的是每个元素都会关联一个
double 类型的分数。redis 正是通过分数来为集合中的成员进行从小到大的排序。有序集合的成员是唯一的，但
分数(score)却可以重复。
# 登录master节点,slave节点是只读的 redis-cli -c -h 192.168.182.112 -p 7001 192.168.182.112:7001> auth 123456 192.168.182.112:7001> ZADD key1 1 redis (integer) 1 192.168.182.112:7001> ZADD key1 2 mongodb (integer) 1 192.168.182.112:7001> ZADD key1 3 mysql (integer) 1 # 已经存在,不能添加 192.168.182.112:7001> ZADD key1 3 mysql (integer) 0 # 已经存在,不能添加 192.168.182.112:7001> ZADD key1 4 mysql (integer) 0 # 获取数据 192.168.182.112:7001> ZRANGE key1 0 10 WITHSCORES 1) "redis" 2) "1" 3) "mongodb" 4) "2" 5) "mysql" 6) "4"
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