Linux 运维 ： Codis 集群

Codis 集群

一、单机集群化

• 哈希槽 < 16834 : 集群损坏
• master down过半 : 集群损坏

1、配置单机多线程，以7001为例

[root@server2 ~]# mkdir /usr/local/redis-cluster/700{1..6} -p
[root@server2 ~]# cd /usr/local/redis-cluster/
[root@server2 redis-cluster]# ls
7001  7002  7003  7004  7005  7006

[root@server2 7001]# vim redis.conf
port 7001
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes
dir /usr/local/redis-cluster/7001
logfile /usr/local/redis-cluster/7001/redis.log
daemonize yes
pidfile /usr/local/redis-cluster/redis.pid

[root@server2 7001]# redis-server redis.conf

• 7002/7003/7004/7005/7006依次进行配置

[root@server2 7001]# cp redis.conf ../7002/
[root@server2 7001]# cp redis.conf ../7003/
[root@server2 7001]# cp redis.conf ../7004/
[root@server2 7001]# cp redis.conf ../7005/
[root@server2 7001]# cp redis.conf ../7006/

• 完成之后查看进程： ps ax

 1073 ?        Ssl    0:00 redis-server *:7001 [cluster]
 1085 ?        Ssl    0:00 redis-server *:7002 [cluster]
 1092 ?        Ssl    0:00 redis-server *:7003 [cluster]
 1098 ?        Ssl    0:00 redis-server *:7004 [cluster]
 1104 ?        Ssl    0:00 redis-server *:7005 [cluster]
 1110 ?        Ssl    0:00 redis-server *:7006 [cluster]

2、配置 redis-trib.rb （需要ruby支持）

• 设置 redis-trib.rb 命令

[root@server2 redis-cluster]# cd ~/redis/redis-4.0.1/src/
[root@server2 src]# file redis-trib.rb 
redis-trib.rb: a /usr/bin/env ruby script text executable
[root@server2 src]# cp redis-trib.rb /usr/local/bin/

• 安装ruby，注意：当前适用版本为 2.2
• 如果yum安装了低版本，update时，需要先安装libyaml
• yum install -y ruby-2.2.3-1.el6.x86_64.rpm libyaml-0.1.3-4.el6_6.x86_64.rpm
• 导入redis模块，注意：需要 redis-4.0.1.gem

[root@server2 redis]# gem list | grep redis
[root@server2 redis]# gem install --local redis-4.0.1.gem 
Successfully installed redis-4.0.1
Parsing documentation for redis-4.0.1
Installing ri documentation for redis-4.0.1
Done installing documentation for redis after 1 seconds
1 gem installed
[root@server2 redis]# gem list | grep redis
redis (4.0.1)

3、集群化配置

[root@server2 redis]# redis-trib.rb create --replicas 1 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7001
127.0.0.1:7002
127.0.0.1:7003
Adding replica 127.0.0.1:7004 to 127.0.0.1:7001
Adding replica 127.0.0.1:7005 to 127.0.0.1:7002
Adding replica 127.0.0.1:7006 to 127.0.0.1:7003

4、测试

• 任何节点操作，都会有 redis 集群分配，自动调转

[root@server2 redis]# redis-cli -c -p 7001
127.0.0.1:7001> set name westos
-> Redirected to slot [5798] located at 127.0.0.1:7002
OK
127.0.0.1:7002> get name
"westos"
127.0.0.1:7002> exit
[root@server2 redis]# redis-cli -c -p 7004
127.0.0.1:7004> get name
-> Redirected to slot [5798] located at 127.0.0.1:7002
"westos"
127.0.0.1:7002> set name redhat
OK
127.0.0.1:7002> exit
[root@server2 redis]# redis-cli -c -p 7006
127.0.0.1:7006> get name
-> Redirected to slot [5798] located at 127.0.0.1:7002
"redhat"

5、损坏测试

• 破坏 1 个 master,slave 自动接管

[root@server2 redis]# ps ax | grep 700
 1073 ?        Ssl    0:02 redis-server *:7001 [cluster]
 1085 ?        Ssl    0:02 redis-server *:7002 [cluster]
 1092 ?        Ssl    0:02 redis-server *:7003 [cluster]
 1098 ?        Ssl    0:02 redis-server *:7004 [cluster]
 1104 ?        Ssl    0:02 redis-server *:7005 [cluster]
 1110 ?        Ssl    0:02 redis-server *:7006 [cluster]
 1155 pts/0    S+     0:00 grep 700
[root@server2 redis]# kill 1073 ##master 7001 down
[root@server2 redis]# redis-trib.rb info 127.0.0.1:7006
127.0.0.1:7002 (e38f5293...) -> 1 keys | 5462 slots | 1 slaves.
127.0.0.1:7003 (e29b054a...) -> 0 keys | 5461 slots | 1 slaves.
127.0.0.1:7004 (85742eee...) -> 0 keys | 5461 slots | 0 slaves.     ##slave 7004 接管 master
[OK] 1 keys in 3 masters.
0.00 keys per slot on average.
[root@server2 redis]# redis-cli -c -p 7006
127.0.0.1:7006> get name    ##集群正常
-> Redirected to slot [5798] located at 127.0.0.1:7002
"redhat"

• 破坏 1 组 master,slave (1组master、slave down后，集群无法使用)

[root@server2 redis]# ps ax | grep 700
 1085 ?        Ssl    0:02 redis-server *:7002 [cluster]
 1092 ?        Ssl    0:02 redis-server *:7003 [cluster]
 1098 ?        Ssl    0:02 redis-server *:7004 [cluster]
 1104 ?        Ssl    0:02 redis-server *:7005 [cluster]
 1110 ?        Ssl    0:02 redis-server *:7006 [cluster]
 1160 pts/0    S+     0:00 grep 700
[root@server2 redis]# kill 1098
##破坏一组master-slave之后，哈希槽不够，集群损坏
[root@server2 redis]# redis-cli -c -p 7006
127.0.0.1:7006> get name
(error) CLUSTERDOWN The cluster is down
127.0.0.1:7006> exit
[root@server2 redis]# redis-trib.rb check 127.0.0.1:7005
>>> Performing Cluster Check (using node 127.0.0.1:7005)
S: 11968d3c17416bca93dcb902012f092aabd82c34 127.0.0.1:7005
   slots: (0 slots) slave
   replicates e38f5293ee0598cab9772bf1c1d3a2bbf6688902
M: e38f5293ee0598cab9772bf1c1d3a2bbf6688902 127.0.0.1:7002
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
M: e29b054ae705e7956fe660022f2df5ce7aa6e40b 127.0.0.1:7003
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: d7a3c0dc89de44fcd0d826657e38acae5e64b8c4 127.0.0.1:7006
   slots: (0 slots) slave
   replicates e29b054ae705e7956fe660022f2df5ce7aa6e40b
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[ERR] Not all 16384 slots are covered by nodes.

• 破坏过半的master，集群也会损坏

二、Mysql+redis

1、Worker（server2）

##安装nginx、php-fpm
[root@server2 redis]# yum install -y php-5.3.3-38.el6.x86_64.rpm php-cli-5.3.3-38.el6.x86_64.rpm php-common-5.3.3-38.el6.x86_64.rpm php-devel-5.3.3-38.el6.x86_64.rpm 
php-fpm-5.3.3-38.el6.x86_64.rpm php-gd-5.3.3-38.el6.x86_64.rpm php-mbstring-5.3.3-38.el6.x86_64.rpm php-mysql-5.3.3-38.el6.x86_64.rpm php-pdo-5.3.3-38.el6.x86_64.rpm
[root@server2 redis]# rpm -ivh nginx-1.8.0-1.el6.ngx.x86_64.rpm 
warning: nginx-1.8.0-1.el6.ngx.x86_64.rpm: Header V4 RSA/SHA1 Signature, key ID 7bd9bf62: NOKEY
Preparing...                ########################################### [100%]
   1:nginx                  ########################################### [100%]
[root@server2 redis]# vim /etc/php.ini
 946 date.timezone = Asia/Shanghai
[root@server2 redis]# vim /etc/php-fpm.d/www.conf 
 39 user = nginx
 41 group = nginx
[root@server2 redis]# id nginx
uid=498(nginx) gid=499(nginx) groups=499(nginx)
[root@server2 ~]# /etc/init.d/nginx start
Starting nginx:                                            [  OK  ]
[root@server2 ~]# /etc/init.d/php-fpm start
Starting php-fpm:                                          [  OK  ]
[root@server2 ~]# netstat -antpl | grep nginx
tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      1300/nginx          
[root@server2 ~]# netstat -antpl | grep php
tcp        0      0 127.0.0.1:9000              0.0.0.0:*                   LISTEN      1309/php-fpm 

##配置nginx、php-fpm
[root@server2 ~]# vim /etc/nginx/conf.d/default.conf 
 10         index  index.php index.html index.htm;

 30     location ~ \.php$ {
 31         root           html;
 32         fastcgi_pass   127.0.0.1:9000;
 33         fastcgi_index  index.php;
 34         fastcgi_param  SCRIPT_FILENAME  /usr/share/nginx/html/$fastcgi_scrip    t_name;
 35         include        fastcgi_params;
 36     }
[root@server2 ~]# cd /usr/share/nginx/html/
[root@server2 html]# vim index.php

[root@server2 html]# /etc/init.d/nginx reload
Reloading nginx:                                           [  OK  ]

##配置redis
[root@server2 html]# cp ~/redis/test.php .
[root@server2 html]# ls
50x.html  index.html  index.php  test.php
[root@server2 html]# vim test.php
  3 $redis->connect('172.25.120.4',6379) or die ("could net connect redis server");
 10 $connect = mysql_connect('172.25.120.3','redis','wes tos');
[root@server2 redis]# unzip phpredis-master.zip 
[root@server2 redis]# cd phpredis-master
[root@server2 phpredis-master]# phpize 
Configuring for:
PHP Api Version:         20090626
Zend Module Api No:      20090626
Zend Extension Api No:   220090626
[root@server2 phpredis-master]# ./configure 
[root@server2 phpredis-master]# make && make install
[root@server2 phpredis-master]# cd /usr/lib64/php/modules/
[root@server2 modules]# ls
curl.so      json.so      mysql.so      pdo_sqlite.so  sqlite3.so
fileinfo.so  mbstring.so  pdo_mysql.so  phar.so        zip.so
gd.so        mysqli.so    pdo.so        redis.so
[root@server2 modules]# cd /etc/php.d/
[root@server2 php.d]# cp mysql.ini redis.ini
[root@server2 php.d]# vim redis.ini 
[root@server2 php.d]# cat redis.ini 
extension=redis.so
[root@server2 php.d]# /etc/init.d/php-fpm reload
Reloading php-fpm: [12-Jul-2018 13:56:53] NOTICE: configuration file /etc/php-fpm.conf test is successful
                                                           [  OK  ]
[root@server2 php.d]# php -m | grep redis
redis

• nginx 配置ok
  

2、redis-master

• Redis（server4）
• server4为master，server3为slave即可

3、Mysql（server3）

[root@server4 ~]# yum install -y mysql-server
[root@server4 ~]# /etc/init.d/mysqld start
[root@server3 ~]# cd redis/
[root@server3 redis]# vim test.sql 
[root@server3 redis]# mysql < test.sql 
[root@server3 redis]# mysql
mysql> use test;
mysql> select * from test;
+----+-------+
| id | name  |
+----+-------+
|  1 | test1 |
|  2 | test2 |
|  3 | test3 |
|  4 | test4 |
|  5 | test5 |
|  6 | test6 |
|  7 | test7 |
|  8 | test8 |
|  9 | test9 |
+----+-------+
mysql> grant all on test.* to redis@'%' identified by 'westos';
Query OK, 0 rows affected (0.00 sec)

• 测试 ，访问 http://172.25.120.2/test.php
  
• redis master和slave查看

[root@server4 ~]# redis-cli 
127.0.0.1:6379> get 1
"test1"
127.0.0.1:6379> exit
[root@server3 redis]# redis-cli 
127.0.0.1:6379> get 1
"test1"
127.0.0.1:6379> exit

以上方式 redis 不能同步 mysql；只有 master 端删除原始的 key-value 才能刷新

##数据库更改数据
[root@server3 redis]# mysql
mysql> update test.test set name='redhat' where id=1;
mysql> select * from test.test;
+----+--------+
| id | name   |
+----+--------+
|  1 | redhat |
|  2 | test2  |
|  3 | test3  |
|  4 | test4  |
|  5 | test5  |
|  6 | test6  |
|  7 | test7  |
|  8 | test8  |
|  9 | test9  |
+----+--------+
##但是redis还是原始值
[root@server3 redis]# redis-cli 
127.0.0.1:6379> get 1
"test1"
127.0.0.1:6379> exit

三、优化

1、worker（server2）

##安装 gearmand
[root@server2 redis]# yum install -y gearmand-1.1.8-2.el6.x86_64.rpm libevent-1.4.13-4.el6.x86_64.rpm libevent-devel-1.4.13-4.el6.x86_64.rpm libevent-doc-1.4.13-4.el6.noarch.rpm libevent-headers-1.4.13-4.el6.noarch.rpm libgearman-1.1.8-2.el6.x86_64.rpm  libgearman-devel-1.1.8-2.el6.x86_64.rpm 
[root@server2 redis]# /etc/init.d/gearmand start
Starting gearmand:                                         [  OK  ]
[root@server2 redis]# netstat -antpl | grep gearmand
tcp        0      0 0.0.0.0:4730                0.0.0.0:*                   LISTEN      3694/gearmand       
tcp        0      0 :::4730                     :::*                        LISTEN      3694/gearmand  

##配置 work.php
[root@server2 redis]# vim worker.php 
[root@server2 redis]# cp worker.php /usr/local/

##添加 gearman 模块
[root@server2 redis]# tar zxf gearman-1.1.2.tgz 
[root@server2 redis]# cd gearman-1.1.2
[root@server2 gearman-1.1.2]# phpize 
Configuring for:
PHP Api Version:         20090626
Zend Module Api No:      20090626
Zend Extension Api No:   220090626
[root@server2 gearman-1.1.2]# ./configure 
[root@server2 gearman-1.1.2]# make && make install
[root@server2 gearman-1.1.2]# cd /etc/php.d/
[root@server2 php.d]# cp redis.ini gearman.ini
[root@server2 php.d]# vim gearman.ini 
[root@server2 php.d]# cat gearman.ini 
extension=gearman.so
[root@server2 php.d]# /etc/init.d/php-fpm reload
Reloading php-fpm: [12-Jul-2018 14:44:53] NOTICE: configuration file /etc/php-fpm.conf test is successful
                                                           [  OK  ]
[root@server2 php.d]# php -m | grep gearman
gearman

2、redis master（server4）不做改动

3、mysql（server3）

##配置 json 函数
[root@server3 redis]# yum install -y mysql-devel gcc unzip
[root@server3 redis]# unzip lib_mysqludf_json-master.zip
[root@server3 redis]# cd lib_mysqludf_json-master
[root@server3 lib_mysqludf_json-master]# gcc $(mysql_config --cflags) -shared -fPIC -o lib_mysqludf_json.so lib_mysqludf_json.c
[root@server3 lib_mysqludf_json-master]# cp lib_mysqludf_json.so /usr/lib64/mysql/plugin/
[root@server3 lib_mysqludf_json-master]# cd
[root@server3 ~]# mysql
mysql> show global variables like 'plugin_dir';
+---------------+-------------------------+
| Variable_name | Value                   |
+---------------+-------------------------+
| plugin_dir    | /usr/lib64/mysql/plugin |
+---------------+-------------------------+
1 row in set (0.00 sec)

mysql> CREATE FUNCTION json_object RETURNS STRING SONAME 'lib_mysqludf_json.so';
Query OK, 0 rows affected (0.00 sec)

mysql> select * from mysql.func;
+-------------+-----+----------------------+----------+
| name        | ret | dl                   | type     |
+-------------+-----+----------------------+----------+
| json_object |   0 | lib_mysqludf_json.so | function |
+-------------+-----+----------------------+----------+
1 row in set (0.00 sec)

##配置 udf 函数
[root@server3 redis]# tar zxf gearman-mysql-udf-0.6.tar.gz 
[root@server3 redis]# cd gearman-mysql-udf-0.6
[root@server3 gearman-mysql-udf-0.6]# ./configure --libdir=/usr/lib64/mysql/plugin/
##依赖性
[root@server3 redis]# yum install -y libevent.x86_64 0:1.4.13-4.el6 libevent-devel.x86_64 0:1.4.13-4.el6 libevent-doc.noarch 0:1.4.13-4.el6 libevent-headers.noarch 0:1.4.13-4.el6  libgearman.x86_64 0:1.1.8-2.el6 libgearman-devel.x86_64 0:1.1.8-2.el6 

[root@server3 gearman-mysql-udf-0.6]# ./configure --libdir=/usr/lib64/mysql/plugin/
[root@server3 gearman-mysql-udf-0.6]# make && make install 

[root@server3 ~]# mysql
mysql> CREATE FUNCTION gman_do_background RETURNS STRING SONAME 'libgearman_mysql_udf.so';
Query OK, 0 rows affected (0.00 sec)

mysql> CREATE FUNCTION gman_servers_set RETURNS STRING SONAME 'libgearman_mysql_udf.so';
Query OK, 0 rows affected (0.00 sec)

mysql> select * from mysql.func;
+--------------------+-----+-------------------------+----------+
| name               | ret | dl                      | type     |
+--------------------+-----+-------------------------+----------+
| json_object        |   0 | lib_mysqludf_json.so    | function |
| gman_do_background |   0 | libgearman_mysql_udf.so | function |
| gman_servers_set   |   0 | libgearman_mysql_udf.so | function |
+--------------------+-----+-------------------------+----------+
mysql> SELECT gman_servers_set('172.25.120.2:4730');
+---------------------------------------+
| gman_servers_set('172.25.120.2:4730') |
+---------------------------------------+
| 172.25.120.2:4730                     |
+---------------------------------------+

##导入触发器
[root@server3 redis]# vim test.sql 
[root@server3 redis]# mysql < test.sql
[root@server3 redis]# mysql
mysql> use test;
mysql> SHOW TRIGGERS FROM test;
------------------+
| datatoredis | UPDATE | test  | BEGIN
    SET @RECV=gman_do_background('syncToRedis', json_object(NEW.id as `id`, NEW.name as `name`)); 
  END | AFTER  | NULL    |          | root@localhost | latin1               | latin1_swedish_ci    | latin1_swedish_ci  |
+-------------+--------+-------+-------------------------------

4、测试

##worker
[root@server2 php.d]# nohup php /usr/local/worker.php &
[1] 6047
[root@server2 php.d]# nohup: ignoring input and appending output to `nohup.out'
##mysal
[root@server3 redis]# mysql
mysql> update test.test set name='hahaha' where id=1;
Query OK, 1 row affected (0.21 sec)

[root@server3 redis]# redis-cli 
127.0.0.1:6379> get 1
"hahaha"
127.0.0.1:6379> exit

• redis 缓存即时同步