要搭建Redis集群高可用
一.部署
因为架构要求，只分配了两台服务器，要搭建Redis集群，为此针对两台服务器搭建了一套特殊的哨兵集群，特殊在不能无限切换，
只能抗住1-2次宕机或网络故障，1-2次故障之后，集群切换机制便不能使用，需要人工按后文的步骤修复；
1.前期准备
准备AB两台服务器部署Redis集群，选择A服务器作为主节点服务器，B服务器作为从节点服务器；
默认服务器上已安装docker环境；
1）在两台服务器创建目录
sudo mkdir -p /iids/redis- 1
2）将redis镜像文件redis_6.0.tar.gz上传到redis目录中，并导入镜像
#导入镜像
gunzip -c redis_6.0.tar.gz | docker load- 1
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2.部署主节点服务器
1)上传redis-master.sh脚本到/iids目录下（见后文）
2)赋予脚本权限
cd /iids
chmod +x redis-master.sh- 1
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3)执行脚本
./redis-master.sh 127.0.0.1 #ip修改为当前服务器地址- 1
3.部署从节点服务器
1)上传redis-slave.sh脚本到/iiids目录下（见后文）
2)赋予脚本权限
cd /iids
chmod +x redis-slave.sh- 1
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3)执行脚本
./redis-slave.sh 127.0.0.1 127.0.0.2 #ip1修改为主节点服务器地址 #ip2为当前服务器地址- 1
4.验证节点是否正常
#进入任一哨兵容器
docker exec -it redis-sentinel-26679 bash
#登录redis（替换ip）
redis-cli -h 127.0.0.1 -p 26382
#查看主节点
SENTINEL masters
#查看从节点
SENTINEL slaves mymaster
#查看集群信息
info
#退出redis
exit
#退出哨兵容器
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输入info：
显示slaves=1,sentinels=3则为正常；
或者在/iids/redis-master/sentinel-26379/log/下查看哨兵日志文件
二.维护
1.场景一：主节点（A）服务器宕机
此时redis集群主节点被选举到了B服务器上，当A服务器恢复后，在A服务器上执行以下操作：
1）删除旧镜像
docker stop redis-6379 redis-sentinel-26379
docker rm redis-6379 redis-sentinel-26379- 1
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2）执行脚本重启A服务器redis；
A服务器redis集群重启后，A服务器上节点都是从节点，该步骤的目的是将B服务器上redis节点的数据同步在A服务器redis节点上；避免下一步操作，重新部署A服务器上节点为主节点时，出现数据丢失
./redis-master.sh 127.0.0.1 #ip修改为当前服务器地址- 1
3）重启整个集群
A服务器：
#删除镜像
docker stop redis-6379 redis-sentinel-26379
docker rm redis-6379 redis-sentinel-26379- 1
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B服务器：
#删除镜像
docker stop redis-6379 redis-sentinel-26379 redis-sentinel-26380
docker rm redis-6379 redis-sentinel-26379 redis-sentinel-26380- 1
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A服务器：
#执行脚本
./redis-master.sh 127.0.0.1 #ip修改为当前服务器地址- 1
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B服务器：
#执行脚本
./redis-slave.sh 127.0.0.1 127.0.0.2 #ip1修改为主节点服务器地址 #ip2为当前服务器地址- 1
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验证：
同上方式验证节点状态
1.场景二：从（B）服务器宕机
直接执行脚本重启：
#删除镜像
docker stop redis-6379 redis-sentinel-26379 redis-sentinel-26380
docker rm redis-6379 redis-sentinel-26379 redis-sentinel-26380
#执行脚本
./redis-slave.sh 127.0.0.1 127.0.0.2 #ip1修改为主节点服务器地址 #ip2为当前服务器地址- 1
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验证：
同上方式验证节点状态
三.执行脚本
redis-master.sh
#!/bin/bash
#接收外部参数
echo "===1.接收外部参数master_ip:$1===="
master_ip=$1
#主从节点port
master_port="6379"
#哨兵节点port
sentinel1_port="26379"
rm -rf /iids/redis-master
echo "===2.开始安装主从节点===="
sudo mkdir -p /iids/redis-master/redis-$master_port/db/log
sudo mkdir -p /iids/redis-master/redis-$master_port/db/data
#授权
chmod 777 /iids/redis-master/redis-$master_port/db/log
chmod 777 /iids/redis-master/redis-$master_port/db/data
#创建节点配置文件
cat > /iids/redis-master/redis-$master_port/db/redis.conf << EOF
protected-mode no
port $master_port
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /var/run/$master_port.pid
loglevel notice
logfile "/var/log/redis.log"
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
rdb-del-sync-files no
dir ./
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-diskless-load disabled
repl-disable-tcp-nodelay no
replica-priority 100
acllog-max-len 128
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush no
lazyfree-lazy-user-del no
oom-score-adj no
oom-score-adj-values 0 200 800
appendonly yes
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
aof-use-rdb-preamble 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-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes
jemalloc-bg-thread yes
EOF
echo "===3.开始启动节点容器===="
sudo docker run \
-d \
--network host \
--restart=always \
--name redis-$master_port \
--privileged=true \
-v /iids/redis-master/redis-$master_port/db/redis.conf:/etc/redis/redis.conf \
-v /iids/redis-master/redis-$master_port/db/data:/data \
-v /iids/redis-master/redis-$master_port/db/log:/var/log \
-v /etc/localtime:/etc/localtime:ro \
redis:6.0 \
redis-server /etc/redis/redis.conf
echo "===4.开始安装哨兵节点===="
#创建宿主机挂在目录
sudo mkdir -p /iids/redis-master/sentinel-$sentinel1_port/log
sudo mkdir -p /iids/redis-master/sentinel-$sentinel1_port/data
#授权
chmod 777 /iids/redis-master/sentinel-$sentinel1_port/log
chmod 777 /iids/redis-master/sentinel-$sentinel1_port/data
#创建哨兵配置文件
cat > /iids/redis-master/sentinel-$sentinel1_port/sentinel.conf << EOF
port $sentinel1_port
protected-mode no
daemonize yes
logfile "/var/log/sentinel-$sentinel1_port.log"
#注意修改为本机内网IP
sentinel announce-ip $master_ip
sentinel announce-port $sentinel1_port
#注意修改为主节点IP
sentinel monitor mymaster ${master_ip} ${master_port} 1
sentinel down-after-milliseconds mymaster 5000
EOF
echo "===5.开始启动哨兵容器===="
#启动哨兵容器
sudo docker run -it \
--name redis-sentinel-$sentinel1_port \
--net=host \
--restart=always \
-v /iids/redis-master/sentinel-$sentinel1_port/sentinel.conf:/usr/local/etc/redis/sentinel.conf \
-v /iids/redis-master/sentinel-$sentinel1_port/log:/var/log \
-v /etc/localtime:/etc/localtime:ro \
-d redis:6.0 /bin/bash
echo "===6.开始启动哨兵===="
#启动哨兵
sudo docker exec -it redis-sentinel-$sentinel1_port /bin/bash -c 'redis-sentinel /usr/local/etc/redis/sentinel.conf'
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redis-slave.sh
#!/bin/bash
#接收外部参数
echo "===1.接收外部参数master_ip:$1 local_ip:$2===="
master_ip=$1
local_ip=$2
#主从节点port
master_port="6379"
slave1_port="6379"
#哨兵节点port
sentinel1_port="26379"
sentinel2_port="26380"
rm -rf /iids/redis-slave
echo "===2.开始安装从节点===="
sudo mkdir -p /iids/redis-slave/redis-$slave1_port/db/log
sudo mkdir -p /iids/redis-slave/redis-$slave1_port/db/data
#授权
chmod 777 /iids/redis-slave/redis-$slave1_port/db/log
chmod 777 /iids/redis-slave/redis-$slave1_port/db/data
#创建节点配置文件
cat > /iids/redis-slave/redis-$slave1_port/db/redis.conf << EOF
replicaof ${master_ip} ${master_port}
protected-mode no
port $slave1_port
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /var/run/redis_$slave1_port.pid
loglevel notice
logfile "/var/log/redis.log"
databases 16
always-show-logo yes
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
rdb-del-sync-files no
dir ./
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-diskless-load disabled
repl-disable-tcp-nodelay no
replica-priority 10
acllog-max-len 128
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush no
lazyfree-lazy-user-del no
oom-score-adj no
oom-score-adj-values 0 200 800
appendonly yes
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
aof-use-rdb-preamble 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-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes
jemalloc-bg-thread yes
EOF
echo "===3.开始启动节点容器===="
sudo docker run \
-d \
--network host \
--restart=always \
--name redis-$slave1_port \
--privileged=true \
-v /iids/redis-slave/redis-$slave1_port/db/redis.conf:/etc/redis/redis.conf \
-v /iids/redis-slave/redis-$slave1_port/db/data:/data \
-v /iids/redis-slave/redis-$slave1_port/db/log:/var/log \
-v /etc/localtime:/etc/localtime:ro \
redis:6.0 \
redis-server /etc/redis/redis.conf
echo "===4.开始安装哨兵节点===="
for port in {$sentinel1_port,$sentinel2_port}
do
#创建宿主机挂在目录
sudo mkdir -p /iids/redis-slave/sentinel-$port/log
sudo mkdir -p /iids/redis-slave/sentinel-$port/data
#授权
chmod 777 /iids/redis-slave/sentinel-$port/log
chmod 777 /iids/redis-slave/sentinel-$port/data
#创建哨兵配置文件
cat > /iids/redis-slave/sentinel-$port/sentinel.conf << EOF
port $port
protected-mode no
daemonize yes
logfile "/var/log/sentinel-$port.log"
#注意修改为本机内网IP
sentinel announce-ip ${local_ip}
sentinel announce-port $port
#注意修改为主节点IP
sentinel monitor mymaster ${master_ip} ${master_port} 1
sentinel down-after-milliseconds mymaster 5000
EOF
done
echo "===5.开始启动哨兵容器===="
#启动哨兵容器
for port in {$sentinel1_port,$sentinel2_port}
do
sudo docker run -it \
--name redis-sentinel-$port \
--net=host \
--restart=always \
-v /iids/redis-slave/sentinel-$port/sentinel.conf:/usr/local/etc/redis/sentinel.conf \
-v /iids/redis-slave/sentinel-$port/log:/var/log \
-v /etc/localtime:/etc/localtime:ro \
-d redis:6.0 /bin/bash
done
echo "===6.开始启动哨兵===="
for port in {$sentinel1_port,$sentinel2_port}
do
#启动哨兵
sudo docker exec -it redis-sentinel-$port /bin/bash -c 'redis-sentinel /usr/local/etc/redis/sentinel.conf'
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