Redis Sentinel 哨兵模式搭建小結

背景

最近項目需求，接觸到了Redis的搭建，簡單記錄下搭建過程當中遇到的坑

整體配置

1. 192.168.1.100:6379 -> master
   192.168.1.101:6379 -> slave
   192.168.1.102:6379 -> slave
   192.168.1.100:26379 -> sentinel
   192.168.1.101:26379 -> sentinel
   192.168.1.102:26379 -> sentinel

搭建步驟

1.安裝redis

# 解壓
tar -xvf /usr/local/redis-3.2.11.tar.gz

mkdir -p /usr/local/redis/bin

cp /usr/local/redis/src/{redis-benchmark,redis-check-aof,redis-check-rdb,redis-cli,redis-sentinel,redis-server,redis-trib.rb} /usr/local/redis/bin

mkdir -p /u01/redis/{6379/{log,data,pid,conf},26379/{log,data,pid,conf}

# 添加環境變量
echo "export PATH=/usr/local/redis/bin:$PATH" >> /etc/profile
source /etc/profile

2.redis-6379配置

redis節點配置基本以下，把以下配置分別cp到三臺虛擬機的/u01/redis/6379/conf/redis_6379.conf

bind 0.0.0.0
protected-mode no
daemonize yes
pidfile "/u01/redis/6379/pid/redis_6379.pid"
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 0
loglevel notice
logfile "/u01/redis/6379/log/redis_6379.log"
databases 16
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename "dump.rdb"
dir "/u01/redis/6379/data"
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
min-slaves-to-write 1
min-slaves-max-lag 10
appendonly no
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-entries 512

啓動服務

# 在三臺虛擬機上分別執行
redis-server /u01/redis/6379/conf/redis_6379.conf

創建主從關係

# 在192.168.1.101
redis-cli -p 6379 SLAVEOF 192.168.1.100 6379

# 在192.168.1.102
redis-cli -p 6379 SLAVEOF 192.168.1.100 6379

查看Replication

192.168.1.101:6379> info replication
# Replication
role:master
connected_slaves:2
min_slaves_good_slaves:2
slave0:ip=192.168.1.102,port=6379,state=online,offset=9577826,lag=1
slave1:ip=192.168.1.103,port=6379,state=online,offset=9577965,lag=0
master_repl_offset:9577965
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:8529390
repl_backlog_histlen:1048576

192.168.1.102:6379> info replication
# Replication
role:slave
master_host:192.168.1.101
master_port:6379
master_link_status:up
master_last_io_seconds_ago:0
master_sync_in_progress:0
slave_repl_offset:9600220
slave_priority:100
slave_read_only:1
connected_slaves:0
min_slaves_good_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

192.168.1.103:6379> info replication
# Replication
role:slave
master_host:192.168.1.101
master_port:6379
master_link_status:up
master_last_io_seconds_ago:0
master_sync_in_progress:0
slave_repl_offset:9612675
slave_priority:100
slave_read_only:1
connected_slaves:0
min_slaves_good_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0

3.sentinel-6379配置

sentinel節點配置基本以下，把以下配置分別cp到三臺虛擬機的/u01/redis/26379/conf/sentinel_26379.conf

sentinel monitor mymaster 後監控的是redis中的master節點，也就是192.168.1.100，因此這個文件在三臺機器上是相同的

port 26379
bind 0.0.0.0
daemonize yes
protected-mode no
dir "/u01/redis/26379/tmp"
logfile "/u01/redis/26379/log/sentinel_26379.log"
sentinel monitor mymaster 192.168.1.100 6379 1

等待啓動完畢後觀察/u01/redis/26379/conf/sentinel_26379.conf文件變化

查看sentinel狀態用info sentinel

redis-cli -h 192.168.1.100 -p 26379 info sentinel

# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=zhuanche01,status=ok,address=192.168.1.100:6379,slaves=2,sentinels=3

總結

1. 我搭建的時候遇到了192.168.1.10一、192.168.1.102上的sentinel啓動後一段時間出錯的問題，後來發現是沒有監控master
2. 再就是出問題了多看log
3. 來年要多寫筆記，年紀大了，記憶力愈來愈差！