数据库未整理的笔记(6)

最新推荐文章于 2021-01-24 17:26:10 发布

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最新推荐文章于 2021-01-24 17:26:10 发布

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分类专栏：数据库

本文链接：https://blog.youkuaiyun.com/weixin_40447206/article/details/81051595

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关系数据库管理系统
Relational Database Management System
数据按照预先设置的组织结构，存储在物理存储介质上。
数据之间可以做关联操作
主流的RDBMS软件
Oracle
DB2
WS-sqlserver
MySQ
NoSQL(NoSQL = Not Only SQL )
意思是"不仅仅是SQL“
泛指非关系型数据库
不需要预先定义数据存储结构
表的每条记录都可以有不同的类型和结构
主流软件
Redis
MongoDB
Memcached
CouchDB
Neo4j
FlockDB
Redis
Remode DIctionary Server(远程字典服务器)
使用C语言编写的，遵守BSD的开源软件
是一款高性能的(Key/Values)分布式内存数据库
并支持数据持久化的NoSQL数据库服务软件
中文网站www.redis.cn
Redis特点：
支持数据持久化，可以把内存里数据保存到硬盘中
不仅仅支持key/values类型的数据，同时还支持list hash set   zset 类型
支持master-salve 模式数据备份
+++++++++++++搭建redis服务器
# tar -xzf redis-4.0.8.tar.gz
# cd redis-4.0.8
#make
#make install

tar -zxf redis-4.0.8.tar.gz
cd redis-4.0.8/
rpm -q gcc gcc-c++ || yum -y install gcc gcc-c++
make && make install
初始化配置
[root@localhost redis-4.0.8]# ./utils/install_server.sh //初始化配置
Welcome to the redis service installer
This script will help you easily set up a running redis server

Please select the redis port for this instance: [6379] //端口
Selecting default: 6379
Please select the redis config file name [/etc/redis/6379.conf] //主配文件
Selected default - /etc/redis/6379.conf
Please select the redis log file name [/var/log/redis_6379.log] //日志文件
Selected default - /var/log/redis_6379.log
Please select the data directory for this instance [/var/lib/redis/6379] //数据库目录
Selected default - /var/lib/redis/6379
Please select the redis executable path [/usr/local/bin/redis-server] //服务程序所在目录

Selected config: #配置摘要信息
Port           : 6379
Config file    : /etc/redis/6379.conf
Log file       : /var/log/redis_6379.log
Data dir       : /var/lib/redis/6379
Executable     : /usr/local/bin/redis-server
Cli Executable : /usr/local/bin/redis-cli   //命令行连接redis服务命令
Is this ok? Then press ENTER to go on or Ctrl-C to abort. //回车完成配置
Copied /tmp/6379.conf => /etc/init.d/redis_6379 //服务启动脚本
启动redis服务（软件安装完成后服务自动运行）
[root@localhost redis-4.0.8]# /etc/init.d/redis_6379 status
Redis is running (5341)
[root@localhost redis-4.0.8]# netstat -utnlp | grep :6379
tcp        0      0 127.0.0.1:6379          0.0.0.0:*               LISTEN      5341/redis-server 1
[root@localhost redis-4.0.8]#

[root@localhost redis-4.0.8]# ps -C redis-server
PID TTY          TIME CMD
5341 ?        00:00:00 redis-server
[root@localhost redis-4.0.
Set keyname   keyvalue   //存储
get keyname    //获取
Select   数据库编号0-15 //切换库
Keys    *    //打印所以变量
Keys   a?   //打印指定变量
Exists keyname   //测试是否存在
ttl   keyname      //查看生存时间
type keyname   //查看类型

连接本机redis服务
[root@localhost redis-4.0.8]# redis-cli
127.0.0.1:6379> ping
PONG
127.0.0.1:6379> set k1 v1
OK
127.0.0.1:6379> get k1
"v1"
127.0.0.1:6379> SHUTDOWN
not connected> exit
[root@localhost redis-4.0.8]#

--------配置文件解析（1）

计量单位
port 6379    //端口
bind 127.0.0.1 //IP地址
tcp-backlog 511 //tcp连接总数
timeout 0    //连接超时时间
tcp-keepalive 300 //长连接时间
daemonize yes   //守护进程方式运行
databases 16 //数据库个数
logfile /var/log/redis_6379.log //pid文件
maxclients 10000 //并发连接数量
dir /var/lib/redis/6379   //数据库目录

93 port 6379

70 bind 127.0.0.1

102 tcp-backlog 511
114 timeout 0

131 tcp-keepalive 300

137 daemonize yes

日志级别
163 # debug (a lot of information, useful for development/testing)
164 # verbose (many rarely useful info, but not a mess like the debug level)
165 # notice (moderately verbose, what you want in production probably)
166 # warning (only very important / critical messages are logged)
167 loglevel notice

187 databases 16
172 logfile /var/log/redis_6379.log
533 # maxclients 10000
264 dir /var/lib/redis/6379
# requirepass foobared 设置登陆密码   设置密码后的登陆方式AUTH <PASSWORD>
设置密码
grep -n requirepass /etc/redis/6379.conf
           501:requirepass 123456
[root@localhost redis-4.0.8]# redis-cli
127.0.0.1:6379> ping
(error) NOAUTH Authentication required.
127.0.0.1:6379> auth 123456   //输入密码
OK
127.0.0.1:6379> ping
PONG
127.0.0.1:6379>

MEMORY MANAGEMENT 内存管理
560 # maxmemory <bytes>

内存清除策略
565 # volatile-lru -> Evict using approximated LRU among the keys with an expire set.   最近最少使用（针对设置了过期时间的key）
566 # allkeys-lru -> Evict any key using approximated LRU. 删除最少使用的key

569 # volatile-random -> Remove a random key among the ones with an expire set. 在设置了过期的key里随机移除

570 # allkeys-random -> Remove a random key, any key. 随机移除key

571 # volatile-ttl -> Remove the key with the nearest expire time (minor TTL) 移除最近过期的key

572 # noeviction -> Don't evict anything, just return an error on write operations. 不删除写满时报错

591 # maxmemory-policy noeviction 定义使用的策略

602 # maxmemory-samples 5   选取模板数据的个数（针对lru 和 ttl 策略）

修改密码后如何调用/etc/init.d/redis_6379 脚本停止服务

给主机53的redis服务设置连接密码密码是123456

vim /etc/redis/6379.conf
501   requirepass     123456
:wq

/etc/init.d/redis_6379   stop
/etc/init.d/redis_6379   start

连接带认证redis服务
[root@db53 ~]# redis-cli
127.0.0.1:6379> ping
(error) NOAUTH Authentication required.
127.0.0.1:6379> auth   123456
OK
127.0.0.1:6379> ping
PONG
127.0.0.1:6379> quit

[root@db53 ~]# redis-cli   -a 123456
127.0.0.1:6379> ping
PONG
127.0.0.1:6379>

]# /etc/init.d/redis_6379   stop

[root@db53 ~]# redis-cli -p 6379 -a 123456 shutdown
]# /etc/init.d/redis_6379   start

------设置连接密码后如何使用脚本停止redis服务

vim /etc/init.d/redis_6379
43             $CLIEXEC -p $REDISPORT -a 123456 shutdown
:wq

]# /etc/init.d/redis_6379   stop

++++++++++++++++++++++++++++++

]#yum -y    install   pcre-devel   zlib-devel
]#tar -zxf nginx-1.12.2.tar.gz
]#cd nginx-1.12.2/
]# ./configure --prefix=/usr/local/nginx
make&&make install
[root@db54 nginx-1.12.2]# ls /usr/local/nginx/
conf html logs sbin

./configure: error: the HTTP rewrite module requires the PCRE library.
You can either disable the module by using --without-http_rewrite_module
option, or install the PCRE library into the system, or build the PCRE library
statically from the source with nginx by using --with-pcre=<path> option.

./configure: error: the HTTP gzip module requires the zlib library.
You can either disable the module by using --without-http_gzip_module
option, or install the zlib library into the system, or build the zlib library
statically from the source with nginx by using --with-zlib=<path> option.

[root@db54 nginx-1.12.2]# /usr/local/nginx/sbin/nginx

[root@db54 nginx-1.12.2]# netstat -utnlp | grep :80
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      23909/nginx: master
[root@db54 nginx-1.12.2]#

[root@db54 nginx-1.12.2]# ps -C nginx
PID TTY          TIME CMD
23909 ?        00:00:00 nginx
23910 ?        00:00:00 nginx
[root@db54 nginx-1.12.2]#

108 yum -y install php-common
109 rpm -q php-common
110 rpm -ivh php-fpm-5.4.16-42.el7.x86_64.rpm
111 systemctl status php-fpm
112 systemctl enable php-fpm
113 systemctl start php-fpm
114 netstat -utnlp | grep :9000

[root@db54 lnmp]# systemctl start php-fpm
[root@db54 lnmp]# netstat -utnlp | grep :9000
tcp        0      0 127.0.0.1:9000          0.0.0.0:*               LISTEN      24312/php-fpm:

mast
[root@db54 lnmp]#

]# vim /usr/local/nginx/conf/nginx.conf

location ~ \.php$ {
            root           html;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
            include        fastcgi_params;
        }

:wq

[root@db54 lnmp]# /usr/local/nginx/sbin/nginx -s stop
[root@db54 lnmp]#
[root@db54 lnmp]#
[root@db54 lnmp]# /usr/local/nginx/sbin/nginx

[root@db54 lnmp]# vim /usr/local/nginx/html/test.php
<?php
phpinfo();
?>
[root@db54 lnmp]#

   13 yum -y install autoconf automake
   14 rpm -ivh php-devel-5.4.16-42.el7.x86_64.rpm
    1 tar -zxf php-redis-2.2.4.tar.gz
    2 cd phpredis-2.2.4/

]# cd   phpredis-2.2.4
[root@db54 phpredis-2.2.4]# phpize
Configuring for:
PHP Api Version:         20100412
Zend Module Api No:      20100525
Zend Extension Api No:   220100525
[root@db54 phpredis-2.2.4]#
]# ll   /usr/bin/php-config

]# ./configure --with-php-config=/usr/bin/php-config
]# make
]# make install

[root@db54 phpredis-2.2.4]# make install
Installing shared extensions:     /usr/lib64/php/modules/
[root@db54 phpredis-2.2.4]#
[root@db54 phpredis-2.2.4]#
[root@db54 phpredis-2.2.4]# ls /usr/lib64/php/modules/
curl.so fileinfo.so json.so phar.so redis.so zip.so
[root@db54 phpredis-2.2.4]#

[root@db54 phpredis-2.2.4]# vim /etc/php.ini
728 extension_dir = "/usr/lib64/php/modules/"
729 ; On windows:
730 extension = "redis.so"
:wq

[root@db54 phpredis-2.2.4]# php -m | grep -i redis
redis
]# systemctl stop php-fpm
]# systemctl start php-fpm

+++++++++++运行Redis服务
   45 tar -zxf redis-4.0.8.tar.gz
   46 cd redis-4.0.8/

   48 make
   49 make install

   51 ./utils/install_server.sh
[root@db54 redis-4.0.8]# /etc/init.d/redis_6379 status
Redis is running (32621)
[root@db54 redis-4.0.8]#

[root@db54 redis-4.0.8]# redis-cli
127.0.0.1:6379> keys *
(empty list or set)
127.0.0.1:6379> quit
[root@db54 redis-4.0.8]#

vim /usr/local/nginx/html/lkredis.php
<?php
$redis = new redis();
$redis->connect('127.0.0.1', 6379);
$redis->set('redistest','666666');
echo $redis->get('redistest');
?>
:wq

254]# http://192.168.4.54/lkredis.php


[root@db54 redis-4.0.8]# redis-cli
127.0.0.1:6379> keys *
1) "redistest"
127.0.0.1:6379> get redistest
"666666"
127.0.0.1:6379>

redis-cli -h 192.168.4.71 -p 6371 shutdown
/etc/init.d/redis_6379   start
vim /etc/redis/6379.conf
$CLIEXEC -h 192.168.4.72 -p 6372   shutdown
netstat -utnlp | grep redis

准备6台redis服务器，具体要求如下：
ip地址                 端口              etho                         日志文件名
192.168.4.51     6051            都可以接收连接请求   redis51.log
192.168.4.52     6052            都可以接收连接请求   redis52.log
192.168.4.53     6053            都可以接收连接请求   redis53.log
192.168.4.54     6054            都可以接收连接请求   redis54.log
192.168.4.55     6055            都可以接收连接请求   redis55.log
192.168.4.56     6056            都可以接收连接请求   redis56.log

环境准备
1 在6台redis服务器上运行服务，按照如下要求修改配置文件后，重启redis服务。

]#vim   /etc/redis/6379.conf
bind   192.168.4.56    #只指定物理接口ip地址
port    6056                 #不允许相同
daemonize yes
cluster-enabled yes
pidfile /var/run/redis_56.pid    #不允许相同
cluster-config-file   nodes-6056.conf   #不允许相同
cluster-node-timeout 5000   #集群节点之间通信超时时间单位秒
:wq

停止服务
]# redis-cli -h 192.168.4.56 -p 6056   [ -a 密码 ] shutdown

启动服务
]# /etc/init.d/redis_6379 start

连接服务
[root@host56 ~]# redis-cli -h 192.168.4.56 -p 6056

装包：在执行创建集群命令的主机安装ruby软件包（192.168.4.51）

安装解释ruby代码的软件包
[root@host51 ~]# yum -y install   ruby   rubygems
[root@host51 ~]# rpm -q rubygems ruby
rubygems-2.0.14.1-30.el7.noarch
ruby-2.0.0.648-30.el7.x86_64
[root@host51 ~]#

[root@host51 redis-cluster]# rpm -ivh --nodeps ruby-devel-2.0.0.648-30.el7.x86_64.rpm

安装ruby连接redis 接口程序 gem
[root@host51 redis-cluster]# which gem
/usr/bin/gem
[root@host51 redis-cluster]# gem install redis-3.2.1.gem
Successfully installed redis-3.2.1
Parsing documentation for redis-3.2.1
Installing ri documentation for redis-3.2.1
1 gem installed
[root@host51 redis-cluster]#

生成创建集群的脚本redis-trib.rb
[root@host51 src]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

[root@host51 src]# cd
[root@host51 ~]# cp redis-4.0.8/src/redis-trib.rb   /usr/local/bin/

创建集群：
redis-trib.rb create   --replicas 1 192.168.4.1:6301 192.168.4.2:6302 192.168.4.4:6304 192.168.4.5:6305 192.168.4.3:6303 192.168.4.6:6306

[ERR] Node 192.168.4.54:6054 is not empty. Either the node already knows other nodes (check with

CLUSTER NODES) or contains some key in database 0.

[root@db54 ~]# redis-cli -h 192.168.4.54 -p 6054
192.168.4.54:6054> flushallcd
OK
192.168.4.54:6054> keys *
(empty list or set)
192.168.4.54:6054> flushall
OK
192.168.4.54:6054> save
OK
192.168.4.54:6054> quit
[root@db54 ~]#

槽位个数是16384
范围0-16383

[root@host51 ~]# redis-trib.rb create   --replicas 1 192.168.4.51:6051 192.168.4.52:6052

192.168.4.53:6053 192.168.4.54:6054 192.168.4.55:6055 192.168.4.56:6056   #创建集群
--replicas 1    表示给master 配置1个slave

>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
192.168.4.51:6051
192.168.4.52:6052
192.168.4.53:6053
Adding replica 192.168.4.55:6055 to 192.168.4.51:6051
Adding replica 192.168.4.56:6056 to 192.168.4.52:6052
Adding replica 192.168.4.54:6054 to 192.168.4.53:6053
M: 0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051
   slots:0-5460 (5461 slots) master
M: 5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052
   slots:5461-10922 (5462 slots) master
M: 6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053
   slots:10923-16383 (5461 slots) master
S: 388c33e7128fc961b381ad3b3c27c3c217912666 192.168.4.54:6054
   replicates 6cdb4c64c48c0ee2ca35bf139660f31ca92821dc
S: 651f7d99965316c1b8a27a2e9b034a5b14c2be55 192.168.4.55:6055
   replicates 0ec903c572270a90f3b140fba31aac15aaf5336b
S: a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056
   replicates 5278df7384edc9774b1a36b0b9d60a813a7424a9
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 192.168.4.51:6051)
M: 0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
M: 388c33e7128fc961b381ad3b3c27c3c217912666 192.168.4.54:6054
   slots:9678 (1 slots) master
   0 additional replica(s)
S: 651f7d99965316c1b8a27a2e9b034a5b14c2be55 192.168.4.55:6055
   slots: (0 slots) slave
   replicates 0ec903c572270a90f3b140fba31aac15aaf5336b
S: a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056
   slots: (0 slots) slave
   replicates 5278df7384edc9774b1a36b0b9d60a813a7424a9
M: 6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053
   slots:10923-16383 (5461 slots) master
   0 additional replica(s)
M: 5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052
   slots:5461-9677,9679-10922 (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.
[root@host51 ~]#

[root@db52 redis-4.0.8]# cat /var/lib/redis/6052/nodes-6052.conf   #集群配置文件
6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053@16053 master - 0 1526096611374

3 connected 10923-16383
0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051@16051 master - 0 1526096612000

1 connected 0-5460
388c33e7128fc961b381ad3b3c27c3c217912666 192.168.4.54:6054@16054 master - 0 1526096611043

4 connected 9678
a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056@16056 slave

5278df7384edc9774b1a36b0b9d60a813a7424a9 0 1526096611745 6 connected
651f7d99965316c1b8a27a2e9b034a5b14c2be55 192.168.4.55:6055@16055 slave

0ec903c572270a90f3b140fba31aac15aaf5336b 0 1526096613000 5 connected
5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052@16052 myself,master - 0

1526096612000 2 connected 5461-9677 9679-10922
vars currentEpoch 6 lastVoteEpoch 0
[root@db52 redis-4.0.8]#

set the above configuration? (type 'yes' to accept): yes
/usr/local/share/gems/gems/redis-3.2.1/lib/redis/client.rb:113:in `call': ERR Slot 0 is already busy

(Redis::CommandError)
   from /usr/local/share/gems/gems/redis-3.2.1/lib/redis.rb:2556:in `block in method_missing'
   from /usr/local/share/gems/gems/redis-3.2.1/lib/redis.rb:37:in `block in synchronize'
   from /usr/share/ruby/monitor.rb:211:in `mon_synchronize'
   from /usr/local/share/gems/gems/redis-3.2.1/lib/redis.rb:37:in `synchronize'
   from /usr/local/share/gems/gems/redis-3.2.1/lib/redis.rb:2555:in `method_missing'
   from /usr/local/bin/redis-trib.rb:212:in `flush_node_config'
   from /usr/local/bin/redis-trib.rb:906:in `block in flush_nodes_config'
   from /usr/local/bin/redis-trib.rb:905:in `each'
   from /usr/local/bin/redis-trib.rb:905:in `flush_nodes_config'
   from /usr/local/bin/redis-trib.rb:1426:in `create_cluster_cmd'
   from /usr/local/bin/redis-trib.rb:1830:in `<main>'
[root@mysql51 ~]#

[ERR] Node 192.168.4.53:6053 is not configured as a cluster node.

每台 redis服务在本机登录查看集群信息

[root@host51 ~]# redis-cli -c -h 192.168.4.51 -p 6051

-c 连接集群中的主机
[root@host51 ~]# redis-cli -c -h 192.168.4.51 -p 6051
192.168.4.51:6051> CLUSTER info
192.168.4.51:6051> CLUSTER nodes
192.168.4.51:6051> quit

192.168.4.51:6051> CLUSTER nodes
388c33e7128fc961b381ad3b3c27c3c217912666 192.168.4.54:6054@16054 master - 0 1526108837942

4 connected 9678
651f7d99965316c1b8a27a2e9b034a5b14c2be55 192.168.4.55:6055@16055 slave

0ec903c572270a90f3b140fba31aac15aaf5336b 0 1526108838444 5 connected
a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056@16056 slave

5278df7384edc9774b1a36b0b9d60a813a7424a9 0 1526108838946 6 connected
6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053@16053 master - 0 1526108837942

3 connected 10923-16383
0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051@16051 myself,master - 0

1526108836000 1 connected 0-5460
5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052@16052 master - 0

1526108839447 2 connected 5461-9677 9679-10922
192.168.4.51:6051>
192.168.4.51:6051>
192.168.4.51:6051>
192.168.4.51:6051> CLUSTER info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:4
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:26580
cluster_stats_messages_pong_sent:20656
cluster_stats_messages_update_sent:2
cluster_stats_messages_sent:47238
cluster_stats_messages_ping_received:20651
cluster_stats_messages_pong_received:26580
cluster_stats_messages_meet_received:5
cluster_stats_messages_received:47236
192.168.4.51:6051>

测试集群：连接master库存储数据，对应的从库会自动同步数据

[root@host51 ~]# redis-cli -c -h master库ip地址 -p 对应的端口号

[root@host51 ~]# redis-cli -c -h 192.168.4.51 -p 6051
192.168.4.51:6051> CLUSTER nodes
192.168.4.51:6051>

[root@host51 ~]# redis-cli -c -h 192.168.4.51 -p 6051
192.168.4.51:6051> set age 99
OK
192.168.4.51:6051> get age
"99"
192.168.4.51:6051>

[root@db54 ~]# redis-cli -c -h 192.168.4.54 -p 6054
192.168.4.54:6054> get age
-> Redirected to slot [741] located at 192.168.4.51:6051
"99"
192.168.4.51:6051>

二、管理集群

rm -rf /var/lib/redis/6379/*
/etc/init.d/redis_6379 stop
/etc/init.d/redis_6379 start
netstat -anutlp |grep redis
cat /var/lib/redis/6379/nodes
redis-trib.rb create --replicas 1 192.168.4.71:6371
192.168.4.72:6372
192.168.4.73:6373
192.168.4.74:6374
192.168.4.75:6375
192.168.4.76:6376

2.1 集群选举测试：   停止某个主库的redi服务对应的从会自动升级主库

2.2 向集群中添加新节点主机 192.168.4.77
1 在主机57运行redis服务（要做对应的集群配置）
装包   初始配置
修改配置文件
vim /etc/redis/6379.conf

停止服务
启动服务
查看端口号
    11 yum -y install gcc
   12 init 6
   13 ls
   14 tar -zxf redis-4.0.8.tar.gz
   15 cd redis-4.0.8/
   16 make
   17 make install
   18 ./utils/install_server.sh
   19 /etc/init.d/redis_6379 status
   20 /etc/init.d/redis_6379 stop
   21 vim /etc/redis/6379.conf
   22 /etc/init.d/redis_6379 start
   23 /etc/init.d/redis_6379 status
[root@redis77 redis-4.0.8]# netstat -utnalp | grep redis-server
tcp        0      0 192.168.4.77:16077      0.0.0.0:*               LISTEN      4705/redis-server 1
tcp        0      0 192.168.4.77:6077       0.0.0.0:*               LISTEN      4705/redis-server 1
[root@redis77 redis-4.0.8]#

redis-trib.rb   选项

add-node   添加主机 (主机的角色是master)
check   检查集群
reshard 重新分配hash slot

2 把主机77添加到集群里
redis-trib.rb add-node    192.168.4.77:6077 192.168.4.71:6071

[root@redis71 ~]# redis-trib.rb add-node 192.168.4.77:6077 192.168.4.71:6071
>>> Adding node 192.168.4.77:6077 to cluster 192.168.4.71:6071
>>> Performing Cluster Check (using node 192.168.4.71:6071)
S: 3bfd47406253a25be9b13504ff0ecdd8524e9a9a 192.168.4.71:6071
   slots: (0 slots) slave
   replicates abb585e1803d756eb0b2d9a1b23790b6712ee7b2
M: cc0f13a4183eb06a771c5190319f7ac40626d04b 192.168.4.73:6073
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
S: 5172f3a9cbd4fe8a488a8d45bdf60ae46ac9f900 192.168.4.76:6076
   slots: (0 slots) slave
   replicates 9717d02408e45ad996dcdbde6401bf1319727e22
S: 30aac94cf32bd5d2446b584be5e7c6b0c07f7da0 192.168.4.74:6074
   slots: (0 slots) slave
   replicates cc0f13a4183eb06a771c5190319f7ac40626d04b
M: 9717d02408e45ad996dcdbde6401bf1319727e22 192.168.4.72:6072
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
M: abb585e1803d756eb0b2d9a1b23790b6712ee7b2 192.168.4.75:6075
   slots:0-5460 (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.
>>> Send CLUSTER MEET to node 192.168.4.77:6077 to make it join the cluster.
[OK] New node added correctly.
[root@redis71 ~]#

redis-trib.rb check 192.168.4.77:6077

[root@redis71 ~]# redis-trib.rb check 192.168.4.77:6077
>>> Performing Cluster Check (using node 192.168.4.77:6077)
M: 6cd754d126998090dcbe409315d7577bcd3b5605 192.168.4.77:6077
   slots: (0 slots) master
   0 additional replica(s)
S: 5172f3a9cbd4fe8a488a8d45bdf60ae46ac9f900 192.168.4.76:6076
   slots: (0 slots) slave
   replicates 9717d02408e45ad996dcdbde6401bf1319727e22
M: abb585e1803d756eb0b2d9a1b23790b6712ee7b2 192.168.4.75:6075
   slots:0-5460 (5461 slots) master
   1 additional replica(s)
S: 3bfd47406253a25be9b13504ff0ecdd8524e9a9a 192.168.4.71:6071
   slots: (0 slots) slave
   replicates abb585e1803d756eb0b2d9a1b23790b6712ee7b2
M: cc0f13a4183eb06a771c5190319f7ac40626d04b 192.168.4.73:6073
   slots:10923-16383 (5461 slots) master
   1 additional replica(s)
M: 9717d02408e45ad996dcdbde6401bf1319727e22 192.168.4.72:6072
   slots:5461-10922 (5462 slots) master
   1 additional replica(s)
S: 30aac94cf32bd5d2446b584be5e7c6b0c07f7da0 192.168.4.74:6074
   slots: (0 slots) slave
   replicates cc0f13a4183eb06a771c5190319f7ac40626d04b
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
[root@redis71 ~]#

手动重新分配hash slot
]# redis-trib.rb   reshard   192.168.4.77:6077

4096   拿出多少个 hash slot 给主机 192.168.4.77

主机 192.168.4.77   id 值

all 从当前所有的master里获取hash slot 个数

检查集群主机状态信息
[root@redis71 ~]# redis-trib.rb check 192.168.4.77:6077
>>> Performing Cluster Check (using node 192.168.4.77:6077)
M: 6cd754d126998090dcbe409315d7577bcd3b5605 192.168.4.77:6077
   slots:0-1364,5461-6826,10923-12287 (4096 slots) master
   0 additional replica(s)

删除节点主机
1 删除master角色的节点主机
1.1 移除占用的hash槽（slot）
1.2 删除主机

]#redis-trib.rb reshard 192.168.4.51:6051
4096    移除hash槽的个数
主机id   目标主机id
主机id   源主机id
done   设置完毕
yes     提交

]# redis-trib.rb del-node 192.168.4.51:6051   8eecda17577349125df9a6fcc37107c6c5f9bdc5

2 删除slave角色的节点主机

]# redis-trib.rb del-node 192.168.4.51:6051 651f7d99965316c1b8a27a2e9b034a5b14c2be55

添加slave角色主机
1 主机运行redis服务并设置集群配置
2 添加slave角色主机

]# redis-trib.rb add-node --slave     要添加到集群中主机ip：端口     集群中已有的任意一个主机的ip:端口

[ERR] Node 192.168.4.54:6054 is not empty. Either the node already knows other nodes (check with

CLUSTER NODES) or contains some key in database 0.

rm -rf   /var/lib/redis/6379/
mkdir /var/lib/redis/6379/
chmod -R a+w   /var/lib/redis/6379/
rm -rf    /var/run/redis_6379.pid
/etc/init.d/redis_6379 start
211 /etc/init.d/redis_6379 status
212 redis-cli -h 192.168.4.54 -p 6054

[root@db54 redis]# redis-cli -c -h 192.168.4.54 -p 6054
192.168.4.54:6054> CLUSTER info
cluster_state:fail
cluster_slots_assigned:0
192.168.4.54:6054> CLUSTER RESET
OK

192.168.4.54:6054>quit;

]# redis-trib.rb add-node --slave   192.168.4.54:6054    192.168.4.51:6051

192.168.4.54:6054> CLUSTER nodes
5278df7384edc9774b1a36b0b9d60a813a7424a9 192.168.4.52:6052@16052 master - 0

1526121459000 2 connected 5461-9677 9679-10922
6cdb4c64c48c0ee2ca35bf139660f31ca92821dc 192.168.4.53:6053@16053 master - 0 1526121460637

3 connected 10923-16383
f7d5c6065d155b5d3d02a4efba10ca2d3722f634 192.168.4.54:6054@16054 myself,slave

0ec903c572270a90f3b140fba31aac15aaf5336b 0 1526121460000 0 connected
0ec903c572270a90f3b140fba31aac15aaf5336b 192.168.4.51:6051@16051 master - 0 1526121459635

8 connected 0-5460 9678
a3af3096ee214c92a178eadf6e9299584899e62f 192.168.4.56:6056@16056 slave

5278df7384edc9774b1a36b0b9d60a813a7424a9 0 1526121460000 2 connected
192.168.4.54:6054>