redis复制集(sentinel)
2024-08-26 20:48:31
https://www.jianshu.com/p/45ffd2a84143
内核配置
cat >> /etc/rc.local << EOF
echo never > /sys/kernel/mm/transparent_hugepage/enabled
EOF
cat >> /etc/sysctl.conf << EOF
vm.overcommit_memory = 1
EOF
静态解析
cat >> /etc/hosts << EOF
10.105.225.8 redis-master
10.154.146.25 redis-slave
EOF
优化
tcp-backlog 65536
timout 300
tcp-keepalive 300
maxclients 10000
maxmemory 2G
maxmemory-policy volatile-lru
配置复制
# master /etc/redis.conf
#daemonize no
daemonize yes
#bind 127.0.0.1
bind 0.0.0.0
#protected-mode yes
protected-mode no
#dir /var/lib/redis/
dir /opt/www/redis/
masterauth @sentinel
requirepass @sentinel
# slave /etc/redis.conf
#daemonize no
daemonize yes
#bind 127.0.0.1
bind 0.0.0.0
#protected-mode yes
protected-mode no
#dir /var/lib/redis/
dir /opt/www/redis/
# 从机多了slaveof配置，注意主从要匹配
slaveof redis-master 6379
masterauth @sentinel
requirepass @sentinel
启用服务
systemctl restart redis && systemctl enable redis
systemctl restart redis-sentinel && systemctl enable redis-sentinel
查看配置状态
#redis-cli -h redis-master -a @sentinel info replication
# Replication
role:master
connected_slaves:1
slave0:ip=10.154.146.25,port=6379,state=online,offset=29,lag=1
master_repl_offset:29
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:28
#redis-cli -h redis-slave -a @sentinel info replication
# Replication
role:slave
master_host:redis-master
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:15
slave_priority:100
slave_read_only:1
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
配置sentinel
# 3台哨兵，2票选举
cat > /etc/redis-sentinel.conf << EOF
port 26379
protected-mode no
daemonize yes
dir /tmp
sentinel monitor mymaster redis-master 6379 2
sentinel down-after-milliseconds mymaster 2000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
sentinel auth-pass mymaster @sentinel
logfile /var/log/redis/sentinel.log
EOF
cat > /etc/sentinel_26380.conf << EOF
port 26380
protected-mode no
daemonize yes
dir /tmp
sentinel monitor mymaster redis-01-master 6379 2
sentinel down-after-milliseconds mymaster 2000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
sentinel auth-pass mymaster @sentinel
logfile /var/log/redis/sentinel_26380.log
EOF
cat > /etc/sentinel_26381.conf << EOF
port 26381
protected-mode no
daemonize yes
dir /tmp
sentinel monitor mymaster redis-02-master 6379 2
sentinel down-after-milliseconds mymaster 2000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
sentinel auth-pass mymaster @sentinel
logfile /var/log/redis/sentinel_26381.log
EOF
cat > /etc/sentinel_26382.conf << EOF
port 26382
protected-mode no
daemonize yes
dir /tmp
sentinel monitor mymaster redis-03-master 6379 2
sentinel down-after-milliseconds mymaster 2000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000
sentinel auth-pass mymaster @sentinel
logfile /var/log/redis/sentinel_26382.log
EOF
# /etc/rc.local
/usr/bin/redis-sentinel /etc/sentinel_26380.conf &
/usr/bin/redis-sentinel /etc/sentinel_26381.conf &
/usr/bin/redis-sentinel /etc/sentinel_26382.conf &
sentinel状态
#redis-cli -h redis-master -p 26379 -a @sentinel info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
master0:name=redis-01,status=ok,address=10.105.225.8:6379,slaves=1,sentinels=3
#redis-cli -h redis-slave -p 26379 -a @sentinel info sentinel
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
master2:name=redis-01,status=ok,address=10.105.225.8:6379,slaves=1,sentinels=3
sentinel切换日志
sentinel日志
[20104] 28 Mar 17:29:54.042 # +sdown master mymaster 10.105.225.8 6379
[20104] 28 Mar 17:29:54.104 # +odown master mymaster 10.105.225.8 6379 #quorum 2/2
[20104] 28 Mar 17:29:54.104 # +new-epoch 1
[20104] 28 Mar 17:29:54.104 # +try-failover master mymaster 10.105.225.8 6379
[20104] 28 Mar 17:29:54.169 # +vote-for-leader 016236a44f1376e34b8e6696c1b7eb0d8ebc3e59 1
[20104] 28 Mar 17:29:54.169 # 10.154.146.25:26379 voted for b9d0dc3e20c5c138304419a17f572e56be61a3fd 1
[20104] 28 Mar 17:29:54.169 # 10.154.43.8:26379 voted for 27c052e9e9b3ad99edc6fe85f5566157e9865309 1
[20104] 28 Mar 17:29:54.169 # 10.154.162.125:26379 voted for b9d0dc3e20c5c138304419a17f572e56be61a3fd 1
[20104] 28 Mar 17:29:54.189 # 10.154.160.30:26379 voted for b9d0dc3e20c5c138304419a17f572e56be61a3fd 1
[20104] 28 Mar 17:29:54.195 # 10.105.93.170:26379 voted for 1823e7153adb3b302a6c05e2a79ce508217e5b9f 1
[20104] 28 Mar 17:30:04.361 # -failover-abort-not-elected master redis-01 10.105.225.8 6379
[20104] 28 Mar 17:30:04.416 # Next failover delay: I will not start a failover before Wed Mar 28 17:35:54 2018
[20104] 28 Mar 17:35:54.336 # +new-epoch 2
[20104] 28 Mar 17:35:54.341 # +vote-for-leader b9d0dc3e20c5c138304419a17f572e56be61a3fd 2
[20104] 28 Mar 17:35:54.341 # Next failover delay: I will not start a failover before Wed Mar 28 17:41:54 2018
[20104] 28 Mar 17:35:54.728 # +config-update-from sentinel 10.154.162.125:26379 10.154.162.125 26379 @ redis-01 10.105.225.8 6379
[20104] 28 Mar 17:35:54.728 # +switch-master redis-01 10.105.225.8 6379 10.154.146.25 6379
[20104] 28 Mar 17:35:54.728 * +slave slave 10.105.225.8:6379 10.105.225.8 6379 @ redis-01 10.154.146.25 6379
[20104] 28 Mar 17:36:24.754 # +sdown slave 10.105.225.8:6379 10.105.225.8 6379 @ redis-01 10.154.146.25 6379
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