redis 5.0 cluster install

cxm.cm

1、下载部署
wget  -b http://download.redis.io/releases/redis-5.0.5.tar.gz
tar xzf redis-5.0.5.tar.gz
cd redis-5.0.5   
make && make install 编译安装
2、集群创建
Redis 集群最小配置为 3主 3 从，先进行简单配置文件设置

cd  /data/redis
mkdir  conf logs 7000 7001
修改配置文件，主要修改以下参数，详细配置文件参考附件

cluster-enabled yes
port 7000
cluster-config-file nodes-7000.conf
pidfile /data/redis/redis_7000.pid
dbfilename 7000-dump.rdb
dir /data/redis/7000
logfile /data/redis/logs/redis-7000.log
include ./redis-conf
使用命令快速创建7001文件 sed 's/7000/7001/g' 7000.conf > 7001.conf
启动单机服务

./redis-server /data/redis/conf/7000.conf
140688:C 08 Nov 2019 16:03:44.932 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
140688:C 08 Nov 2019 16:03:44.932 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=140688, just started
140688:C 08 Nov 2019 16:03:44.932 # Configuration loaded
p此时在/data/redis/6379 文件夹下将看到如下文件

-rw-r--r-- 1 root root   114 Nov  8 15:37 nodes-7000.conf
-rw-r--r-- 1 root root     6 Nov  8 15:37 redis_7000.pid
-rw-r--r-- 1 root root 10275 Nov  8 15:36 redis.conf
参照如上配置分别启动7000 7001 7002 7003 7004 7005六个节点
使用命令进行集群创建

./redis-cli --cluster create 192.168.70.4:7000 192.168.70.4:7001 192.168.41.14:7002 192.168.41.14:7003 192.168.41.18:7004  192.168.41.18:7005  --cluster-replicas 1
--cluster-replicas 1 命令的意思： 一主一从配置，六个节点就是 三主三从

[root@bjxg-elk2-kafka-02 src]# ./redis-cli --cluster create 192.168.70.4:7000 192.168.70.4:7001 192.168.41.14:7002 192.168.41.14:7003 192.168.41.18:7004  192.168.41.18:7005  --cluster-replicas 1
>>> Performing hash slots allocation on 6 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.41.14:7003 to 192.168.70.4:7000
Adding replica 192.168.41.18:7005 to 192.168.41.14:7002
Adding replica 192.168.70.4:7001 to 192.168.41.18:7004
M: 0f96b6e007c27255d90f50737073c34741e7aa32 192.168.70.4:7000
   slots:[0-5460] (5461 slots) master
S: 4b0d525711e0704266e78acb15c3053c94dc9dbd 192.168.70.4:7001
   replicates fbadfccf8e5228d35afa93a17a7e8aef70a3da43
M: fccbefd52d4bb9ea348a9601d83844a81d3d59ee 192.168.41.14:7002
   slots:[5461-10922] (5462 slots) master
S: ae2cb8a7821d16fe3770f71ffcc47522d72a24d2 192.168.41.14:7003
   replicates 0f96b6e007c27255d90f50737073c34741e7aa32
M: fbadfccf8e5228d35afa93a17a7e8aef70a3da43 192.168.41.18:7004
   slots:[10923-16383] (5461 slots) master
S: a3b9b3edd2a6c69666d2ca7964a1186b2da063a4 192.168.41.18:7005
   replicates fccbefd52d4bb9ea348a9601d83844a81d3d59ee
Can I set the **ve 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 192.168.70.4:7000)
M: 0f96b6e007c27255d90f50737073c34741e7aa32 192.168.70.4:7000
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
S: a3b9b3edd2a6c69666d2ca7964a1186b2da063a4 192.168.41.18:7005
   slots: (0 slots) slave
   replicates fccbefd52d4bb9ea348a9601d83844a81d3d59ee
S: 4b0d525711e0704266e78acb15c3053c94dc9dbd 192.168.70.4:7001
   slots: (0 slots) slave
   replicates fbadfccf8e5228d35afa93a17a7e8aef70a3da43
M: fccbefd52d4bb9ea348a9601d83844a81d3d59ee 192.168.41.14:7002
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
S: ae2cb8a7821d16fe3770f71ffcc47522d72a24d2 192.168.41.14:7003
   slots: (0 slots) slave
   replicates 0f96b6e007c27255d90f50737073c34741e7aa32
M: fbadfccf8e5228d35afa93a17a7e8aef70a3da43 192.168.41.18:7004
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
[OK] All nodes agree **ut slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
检查集群状态
redis-cli --cluster check 192.168.41.14:7002
[root@bjxg-elk2-kafka-02 src]# ./redis-cli --cluster check 192.168.41.14:7002
192.168.41.14:7002 (fccbefd5...) -> 0 keys | 5462 slots | 1 slaves.
192.168.41.18:7004 (fbadfccf...) -> 0 keys | 5461 slots | 1 slaves.
192.168.70.4:7000 (0f96b6e0...) -> 0 keys | 5461 slots | 1 slaves.
[OK] 0 keys in 3 masters.
0.00 keys per slot on average.
>>> Performing Cluster Check (using node 192.168.41.14:7002)
M: fccbefd52d4bb9ea348a9601d83844a81d3d59ee 192.168.41.14:7002
   slots:[5461-10922] (5462 slots) master
   1 additional replica(s)
M: fbadfccf8e5228d35afa93a17a7e8aef70a3da43 192.168.41.18:7004
   slots:[10923-16383] (5461 slots) master
   1 additional replica(s)
S: 4b0d525711e0704266e78acb15c3053c94dc9dbd 192.168.70.4:7001
   slots: (0 slots) slave
   replicates fbadfccf8e5228d35afa93a17a7e8aef70a3da43
S: a3b9b3edd2a6c69666d2ca7964a1186b2da063a4 192.168.41.18:7005
   slots: (0 slots) slave
   replicates fccbefd52d4bb9ea348a9601d83844a81d3d59ee
S: ae2cb8a7821d16fe3770f71ffcc47522d72a24d2 192.168.41.14:7003
   slots: (0 slots) slave
   replicates 0f96b6e007c27255d90f50737073c34741e7aa32
M: 0f96b6e007c27255d90f50737073c34741e7aa32 192.168.70.4:7000
   slots:[0-5460] (5461 slots) master
   1 additional replica(s)
[OK] All nodes agree **ut slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
测试集群状态

redis-cli -c -h  192.168.41.14 -p 7002
[root@bjxg-elk2-kafka-02 src]# ./redis-cli -c -h  192.168.41.14 -p 7002
192.168.41.14:7002> cluster info
cluster_statek
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:3
cluster_stats_messages_ping_sent:213
cluster_stats_messages_pong_sent:231
cluster_stats_messages_meet_sent:5
cluster_stats_messages_sent:449
cluster_stats_messages_ping_received:231
cluster_stats_messages_pong_received:218
cluster_stats_messages_received:449
查看帮助命令

./redis-cli --help

测试性能

redis-benchmark -h192.168.41.14 -p 7002 -c 100 -n 100000
100个并发连接，100000个请求，检测host为localhost 端口为7002的redis服务器性能
3、遇到的问题
1、WARNING overcommit_memory is set to 0! Background save may fail
under low memory condition. To fix this issue add
'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run
the command 'sysctl vm.overcommit_memory=1' for this to take effect.

解决：
如果“/proc/sys/vm/overcommit_memory”的值为0，则会表示开启了OOM。可以设置为1关闭OOM
需要在文件/etc/sysctl.conf中增加一行 vm.overcommit_memory = 1，然后执行命令“sysctl -p”以生效。

2、WARNING you have Transparent Huge Pages (THP) support enabled in
your kernel. This will create latency and memory usage issues with
Redis. To fix this issue run the command 'echo never >
/sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to
your /etc/rc.local in order to retain the setting after a reboot.
Redis must be restarted after THP is disabled.

解决：
你使用的是透明大页，可能导致redis延迟和内存使用问题。执行echo never > /sys/kernel/mm/transparent_hugepage/enabled修复该问题。
永久解决方法：
将其写入/etc/rc.local文件中
echo never > /sys/kernel/mm/redhat_transparent_hugepage/enabled

3、TCP监听队列大小
即TCP listen的backlog大小，“/proc/sys/net/core/somaxconn”的默认值一般较小如128，需要修改大一点，比如改成32767。立即生效还可以使用命令：sysctl -w net.core.somaxconn=32767。
要想永久生效，需要在文件/etc/sysctl.conf中增加一行：net.core.somaxconn = 32767，然后执行命令“sysctl -p”以生效。
Redis配置项tcp-backlog的值不能超过somaxconn的大小。