Redis Cluster集群搭建

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1.服务器

192.168.1.201

192.168.1.204

192.168.1.205

192.168.1.206

192.168.1.207

192.168.1.208

因为Redis Cluster如果数据冗余是1的话,至少要3Master3Slave。

2.安装步骤

(1)准备工作

mkdir /usr/local/redis_cluster

mkdir /usr/local/redis_cluster (安装所需的文件)

cd /usr/local/redis_cluster

上传redis-3.2.7.tar.gz和rubygems-2.6.10.tgz(其它的yum安装即可,个人认为应该用高版本比较好兼容,此环境因为其它依赖都已经装了,故不再重复安装)


安装zlib

rpm -qa |grep zlib (检查系统中是否安装)

没有的话可以安装zlib-1.2.6.tar

./configure

make && make install


安装ruby

rpm -qa |grep ruby

没有的话可以安装ruby1.9.2

./configure –prefix=/usr/local/ruby

make && make install

cp ruby /usr/local/bin/

这里我们用YUM安装:

yuminstall -y ruby.x86_64 ruby-devel.x86_64 ruby-rdoc.x86_64


安装rubygem(可能需要外网)

tar zxvf rubygems-2.6.10.tgz

为避免报错可以先升级gem

gem update –system

进行安装:

ruby setup.rb

cpbin/gem /usr/local/bin/


(2)修改配置文件

解压redis-3.2.7.tar.gz

tar -zxvf redis-3.2.7.tar.gz

cd redis-3.2.7

make MALLOC=libc(如果直接make编译的话,jemalloc可能会报错,源于源代码zmalloc.c中,redis2.4以上自带的是jemalloc,所以需要指定,我没有试过指定jemalloc可否,故选用标准内存管理)

make install PREFIX=/usr/local/redis

cp src/redis-server /usr/local/bin/

cp src/redis-cli /usr/local/bin/

cp src/redis-trib.rb /usr/local/bin/

sed -e "s/#.*//g" redis.conf | awk ‘{if (length!=0) print $0}‘ > redis_6379.conf(去注释,好调试)

修改redis.conf

bind 192.168.1.206 (建议绑定,否则客户端重定向时会报错)

protected-mode no 3.0新特性,yes只允许本地127.0.0.1连接)

port 7379  (监听端口)

tcp-backlog 511

timeout 0

tcp-keepalive 0

daemonize no (关闭后台运行)

supervised no

pidfile /var/run/redis_7379.pid

loglevel notice

logfile  "/data/redis/logs/7379.log" (定义日志文件路径)

databases 16

save 900 1

save 300 10

save 60 10000

stop-writes-on-bgsave-error yes

rdbcompression yes

rdbchecksum yes

dbfilename 7379.rdb   rdb存储文件)

dir /data/redis/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

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

cluster-enabled yes   (开启Cluster

cluster-node-timeout 15000  (集群超时时间,节点超时多久则认为它宕机

cluster-migration-barrier 1 (主有1个可用从时才可被迁移)

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

 

maxmemory 4G

maxmemory-policy allkeys-lru  (当内存用满时的置换策略)

cluster-config-file  nodes-7379.conf  (集群配置文件,无需创建)

cluster-require-full-coverage no  (槽是否全覆盖,一定要no,不然有节点宕机,16384槽无法覆盖满,会导致整个集群停止服务)

 

内存置换策略

  1. noeviction: 不进行置换,表示即使内存达到上限也不进行置换,所有能引起内存增加的命令都会返回error

  2. allkeys-lru: 优先删除掉最近最不经常使用的key,用以保存新数据

  3. volatile-lru: 只从设置失效(expire set)的key中选择最近最不经常使用的key进行删除,用以保存新数据

  4. allkeys-random: 随机从all-keys中选择一些key进行删除,用以保存新数据

  5. volatile-random: 只从设置失效(expire set)的key中,选择一些key进行删除,用以保存新数据

  6. volatile-ttl: 只从设置失效(expire set)的key中,选出存活时间(TTL)最短的key进行删除,用以保存新数据


(3)启动各实例

这里不用单独先把实例的主从设定,因为在创建集群时,会自动选择主从关系;

cp redis-3.2.7/redis.conf ./redis_6379.conf

mkdir -p /data/redis/{data,logs}

提前准备:

Redis启动时会报告警,虽然不影响使用,但长期可能会有影响,故提示下;

sysctl vm.overcommit_memory=1

内存分配策略:

0,  表示内核将检查是否有足够的可用内存供应用进程使用;如果有足够的可用内存,内存申请允许;否则,内存申请失败,并把错误返回给应用进程;

1,  表示内核允许分配所有的物理内存,而不管当前的内存状态如何;

2,  表示内核允许分配超过所有物理内存和交换空间总和的内存。

echo never > /sys/kernel/mm/transparent_hugepage/enabled(写到rc.local里)

Redis报错信息提示:表示你使用的是透明大页,可能导致redis延迟和内存使用问题

启动6个实例(必须是无数据的空节点):

redis-server /usr/local/redis_cluster/redis_6379.conf >/data/redis/logs/6379.log 2>&1 & (注意端口号)

检查实例状态:

redis-cli -c -h 192.168.1.201 -p 6379 cluster nodes

此时每个实例都是master,并且会提示cluster配置未找到,勿急。


(4)建立集群

redis-trib.rb create --replicas 1 192.168.1.201:6379192.168.1.204:6380 192.168.1.205:6381 192.168.1.206:7379 192.168.1.207:7380192.168.1.208:7381 (这里用工具启动,手动启动步骤较复杂,下文中会有提到,仅作为分析原理使用)

[[email protected] redis_cluster]# redis-trib.rb create --replicas 1  192.168.1.201:6379 192.168.1.204:6380 192.168.1.205:6381 192.168.1.206:7379  192.168.1.207:7380 192.168.1.208:7381

>>> Creating cluster

>>> Performing hash slots allocation on 6 nodes...

Using 3 masters:

  1. 168.1.208:7381

  2. 168.1.207:7380

  3. 168.1.206:7379

Adding replica 192.168.1.205:6381 to 192.168.1.208:7381

Adding replica 192.168.1.204:6380 to 192.168.1.207:7380

Adding replica 192.168.1.201:6379 to 192.168.1.206:7379

S: 187f8d5d047da792b598329cebd537d1b54daaec 192.168.1.201:6379

   replicates  6f1a1dda2742ce5fc7e3699f846ef8c47ab182f4

S: 9ecc74cf38b846656185e460c360761272de55b6 192.168.1.204:6380

   replicates  810783993b6e59aec3b804e27ab1482a1d60bda9

S: 55922fb281141a1f6e613fe45c8cfe4e946c0588 192.168.1.205:6381

   replicates  b6605d95f8609110a9f8cbee371e7ab4f22aa4e3

M: 6f1a1dda2742ce5fc7e3699f846ef8c47ab182f4 192.168.1.206:7379

   slots:10923-16383 (5461  slots) master

M: 810783993b6e59aec3b804e27ab1482a1d60bda9 192.168.1.207:7380

   slots:5461-10922 (5462  slots) master

M: b6605d95f8609110a9f8cbee371e7ab4f22aa4e3 192.168.1.208:7381

   slots:0-5460 (5461 slots)  master

Can I set the above 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  192.168.1.201:6379)

S: 187f8d5d047da792b598329cebd537d1b54daaec 192.168.1.201:6379

   slots: (0 slots) slave

   replicates  6f1a1dda2742ce5fc7e3699f846ef8c47ab182f4

M: 810783993b6e59aec3b804e27ab1482a1d60bda9 192.168.1.207:7380

   slots:5461-10922 (5462  slots) master

   1 additional replica(s)

S: 55922fb281141a1f6e613fe45c8cfe4e946c0588 192.168.1.205:6381

   slots: (0 slots) slave

   replicates  b6605d95f8609110a9f8cbee371e7ab4f22aa4e3

S: 9ecc74cf38b846656185e460c360761272de55b6 192.168.1.204:6380

   slots: (0 slots) slave

   replicates  810783993b6e59aec3b804e27ab1482a1d60bda9

M: b6605d95f8609110a9f8cbee371e7ab4f22aa4e3 192.168.1.208:7381

   slots:0-5460 (5461 slots)  master

   1 additional replica(s)

M: 6f1a1dda2742ce5fc7e3699f846ef8c47ab182f4 192.168.1.206:7379

   slots:10923-16383 (5461  slots) master

   1 additional replica(s)

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

命令中的1表示按1:1的比例建立主从关系,这里了既是3:3啦;

另外我们也可以看出主从已经自动选取。


(5)检查集群状态

redis-trib.rb check 192.168.1.204:6380

[[email protected] redis_cluster]#  redis-trib.rb check 192.168.1.204:6380

>>> Performing Cluster  Check (using node 192.168.1.204:6380)

S:  9ecc74cf38b846656185e460c360761272de55b6 192.168.1.204:6380

    slots: (0 slots) slave

    replicates 810783993b6e59aec3b804e27ab1482a1d60bda9

M:  b6605d95f8609110a9f8cbee371e7ab4f22aa4e3 192.168.1.208:7381

    slots:0-5460 (5461 slots) master

    1 additional replica(s)

S:  55922fb281141a1f6e613fe45c8cfe4e946c0588 192.168.1.205:6381

    slots: (0 slots) slave

    replicates b6605d95f8609110a9f8cbee371e7ab4f22aa4e3

M:  810783993b6e59aec3b804e27ab1482a1d60bda9 192.168.1.207:7380

    slots:5461-10922 (5462 slots) master

    1 additional replica(s)

S:  187f8d5d047da792b598329cebd537d1b54daaec 192.168.1.201:6379

    slots: (0 slots) slave

    replicates 6f1a1dda2742ce5fc7e3699f846ef8c47ab182f4

M:  6f1a1dda2742ce5fc7e3699f846ef8c47ab182f4 192.168.1.206:7379

    slots:10923-16383 (5461 slots) master

    1 additional replica(s)

[OK] All nodes agree about slots  configuration.

>>> Check for open slots...

>>> Check slots  coverage...

[OK] All 16384 slots covered.

没有任何警告或错误,表示集群启动成功并处于ok状态;

至此整个集群就搭建完毕了。


参考文章:

http://blog.csdn.net/dc_726/article/details/48552531

http://blog.csdn.net/myrainblues/article/details/25881535/


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