背景
业务稳定性要求需要一套redis集群来保障
因此采用 redis cluster 集群
环境
| 名称 |
ip地址 |
cpu |
内存 |
master端口 |
slave端口 |
| redis-651 |
10.65.6.51 |
4c |
8G |
7001 |
7002 |
| redis-652 |
10.65.6.52 |
4c |
8G |
7001 |
7002 |
| redis-653 |
10.65.6.53 |
4c |
8G |
7001 |
7002 |
安装配置，以10.65.6.51 为例
#下载软件包
wget http://download.redis.io/releases/redis-5.0.5.tar.gz
#编译安装、
tar -zxvf redis-5.0.5.tar.gz
cd redis-5.0.5
make && make install
#修改必要的环境参数
echo 'never' > /sys/kernel/mm/transparent_hugepage/defrag
echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled
#加入开机启动项：
vi /etc/rc.local
echo 'never' > /sys/kernel/mm/transparent_hugepage/defrag
echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled
#修改内核参数
vi /etc/sysctl.conf
vm.overcommit_memory = 1
net.core.somaxconn= 1024
vm.max_map_count=655360
#修改连接数
ulimit -n 655350
#创建redis用户
useradd -d /exporter/redis -m redis
#在redis用户根目录创建redis_cluster
su - redis
mkdir redis_cluster
mkdir logs
#在 redis_cluster 目录下，创建名为7001、7002的目录，并将 redis.conf 拷贝到这二个目录中，提前准备好 redis 配置文件
cd redis_cluster
mkdir 7001 7002
#配置 7001 redis.conf 文件并启动实例
cd 7001
#cat redis.conf
bind 0.0.0.0
protected-mode yes
port 7001
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /exporter/redis/redis_7001.pid
loglevel notice
logfile "/exporter/redis/logs/redis-7001.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump-7001.rdb
dir ./
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
maxmemory 2147483648
appendonly yes
appendfilename "appendonly-7001.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
cluster-enabled yes
cluster-config-file nodes-7001.conf
cluster-node-timeout 15000
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
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
masterauth m2i3s5
requirepass m2i3s5
# cat start.sh
redis-server ./redis.conf &
#启动 7001 redis 实例
bash start.sh
#配置 7002 redis.conf 文件并启动实例
cd /exporter/redis/redis_cluster/7002
$ cat redis.conf
bind 0.0.0.0
protected-mode yes
port 7002
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /exporter/redis/redis_7002.pid
loglevel notice
logfile "/exporter/redis/logs/redis-7002.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump-7002.rdb
dir ./
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
maxmemory 2147483648
appendonly yes
appendfilename "appendonly-7002.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
cluster-enabled yes
cluster-config-file nodes-7002.conf
cluster-node-timeout 15000
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
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
masterauth m2i3s5
requirepass m2i3s5
# cat start.sh
redis-server ./redis.conf &
#启动 7002 redis 实例
bash start.sh
#查看节点实例端口是否启动，查看已经启动
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另外两个服务器节点 redis实例配置并启动
按照10.65.6.51 实例配置，依次启动redis 实例
创建集群
redis-cli -a m2i3s5 --cluster create 10.65.6.51:7001 10.65.6.51:7002 10.65.6.52:7001 10.65.6.52:7002 10.65.6.53:7001 10.65.6.53:7002 --cluster-replicas 1
输入 yes 自动完成集群创建
#参数
–cluster-replicas 1
最后面的数字是指每个master带有多少个slave从结点。
这里最后的数是1，那就是每个master节点有一个slave从节点。如果最后的数字是2，那么代表每个master对应2个slave从结点。
-a 指定密码
# 查看集群信息
$ redis-cli -c -p 7002 -h 10.65.6.53 -a m2i3sc5
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
10.65.6.53:7002> CLUSTER nodes
5a3ac40d4fb508294581d54a5f1c78482e7510bc 10.65.6.51:7001@17001 master - 0 1667381997109 1 connected 0-5460
feec77be74afc3822711614ae9108f5b77f3fa11 10.65.6.53:7001@17001 master - 0 1667381995099 10 connected 10923-16383
3988c010767e71c4b86941a709d5ae7c96d2a662 10.65.6.53:7002@17002 myself,slave 5a3ac40d4fb508294581d54a5f1c78482e7510bc 0 1667381985000 0 connected
3299250eeb002bd9a24a7f69900ab6795a908c67 10.65.6.52:7002@17002 slave feec77be74afc3822711614ae9108f5b77f3fa11 0 1667381996103 10 connected
26a308f4be77175789d8d400aec57ae16548122b 10.65.6.51:7002@17002 slave 218f90ba77b311c205ca7c96daa64a6f27aa363c 0 1667381994094 9 connected
218f90ba77b311c205ca7c96daa64a6f27aa363c 10.65.6.52:7001@17001 master - 0 1667381993091 9 connected 5461-10922
#主从关系
master slave
10.65.6.51:7001 10.65.6.53:7002
10.65.6.52:7001 10.65.6.51:7002
10.65.6.53:7001 10.65.6.52:7002
调整集群内存
# redis-cli -c -p 7001 -h 10.65.6.53 -a m2i3s5
10.65.6.53:7001> info memory
#maxmemory_human:2.00G,将集群内存调整至 3G
# redis-cli -c -p 7001 -h 10.65.6.53 -a m2i3s5
10.65.6.53:7001> info memory
