A, Redis master from
What is the use Redis master-slave:
1. Back up data: using slave node to back up the data master node, thus avoiding the master node goes down all result in data loss.
2. separate read and write: Master node only responsible for writing, while the slave node is responsible only for reading. Ratio, for example, the reader 10: 1, so that the efficiency can be improved.
As shown below:
A Master can have multiple Slave, and each can have multiple Slave Slave, so that you can form a powerful server cluster structure.
Two, Redis master node configuration
1.Redis source compiler installation
In CentOS7:
# Installed gcc compiler yum the install gcc -Y # download Redis wget http://download.redis.io/releases/redis-5.0.7.tar.gz # decompress the tar-5.0.7.tar.gz the xzf Redis # move the folder to / usr / local in mv redis-5.0.7 / usr / local / # redis into the directory cd /usr/local/redis-5.0.7 # compiler make all
# Install TCL yum -y install TCL # redis test run make test
# Mounted to the / usr / local / bin the make the install
Enter / under usr / local / bin View installed redis command:
[root@centos-base bin]# ll total 32772 -rwxr-xr-x. 1 root root 4366808 Jan 5 14:20 redis-benchmark -rwxr-xr-x. 1 root root 8125200 Jan 5 14:20 redis-check-aof -rwxr-xr-x. 1 root root 8125200 Jan 5 14:20 redis-check-rdb -rwxr-xr-x. 1 root root 4807880 Jan 5 14:20 redis-cli lrwxrwxrwx. 1 root root 12 Jan 5 14:20 redis-sentinel -> redis-server -rwxr-xr-x. 1 root root 8125200 Jan 5 14:20 redis-server
2.Redis Configuration
Copy redis.conf:
cd /etc mkdir redis cd /usr/local/redis-5.0.7 cp redis.conf /etc/redis/redis.conf
Change setting:
we /etc/redis/redis.conf
bind 192.168.1.181 127.0.0.1 # service IP address port 6379 # service port daemonize yes # is running as a daemon form dbfilename dump.rdb # persistent data file name dir / var / lib / redis # persistent data files and logfile /var/log/redis/redis-server.log # log file location database 16 # total database 16, No. 15 ~. 1 slaveof # of the primary and replication (for distributed)
Note: The persistent storage of address data files and log files previously created to store the file directory.
cd / var / lib mkdir redis cd / var / log mkdir redis
Configuration File Reference:
(Transfer from https://blog.csdn.net/ljphilp/article/details/52934933 )
View Code
3. Set Redis service
Configuration Management systemctl Redis service:
Edit the file # vim /usr/lib/systemd/system/redis.service # in redis.service file and add the following to save ###################### #### [Unit] the Description = the Redis-5.0.7-6379 the After network.target = [-Service] the Type = the forking PIDFILE = / var / RUN / redis-6379.pid ExecStart = / usr / local / bin / redis- /etc/redis/redis.conf Server ExecReload = / bin / -s the kill the HUP $ MAINPID ExecStop = / bin / -s the kill the QUIT $ MAINPID PrivateTmp to true = [the Install] WantedBy = multi-user.target ###### ##################### # load service systemctl daemon-reload
reids service operation:
systemctl start redis # start systemctl stop redis # stop systemctl restart redis # restart systemctl status redis # view the status systemctl enable redis # boot systemctl disable redis # cancel boot
4. Run Redis
[root@centos-base system]# systemctl start redis
[root@centos-base system]# systemctl status redis
鈼[0m redis.service - Redis-5.0.7-6379
Loaded: loaded (/usr/lib/systemd/system/redis.service; enabled; vendor preset: disabled)
Active: active (running) since Sun 2020-01-05 15:19:46 CST; 4s ago
Process: 27232 ExecStop=/bin/kill -s QUIT $MAINPID (code=exited, status=0/SUCCESS)
Process: 27243 ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf (code=exited, status=0/SUCCESS)
Main PID: 27244 (redis-server)
CGroup: /system.slice/redis.service
鈹斺攢27244 /usr/local/bin/redis-server 127.0.0.1:6379
Jan 05 15:19:46 centos-base systemd[1]: Starting Redis-5.0.7-6379...
Jan 05 15:19:46 centos-base systemd[1]: Started Redis-5.0.7-6379.
View process:
[root@centos-base system]# ps -ef | grep redis root 27244 1 0 15:19 ? 00:00:00 /usr/local/bin/redis-server 127.0.0.1:6379 root 27251 17132 0 15:22 pts/0 00:00:00 grep --color=auto redis
Three, Redis from node configuration
1. Installation from node Redis
Referring to the master node during installation, deployment from a node.
2. From node configuration
Redis.conf modify the configuration file:
# Replicaof modify configuration items, fill in the master node IP and port replicaof 192.168 . 1.181 6379
3. Restart from the master node Redis service
Fourth, the master-slave operation
1. See the master node status
Excuting an order:
[root@centos-base system]# redis-cli -h 192.168.1.181 info Replication # Replication role:master connected_slaves:1 slave0:ip=192.168.1.180,port=6379,state=online,offset=42,lag=1 master_replid:14e0a788c85de285ae34ab98f41893aaf097335a master_replid2:0000000000000000000000000000000000000000 master_repl_offset:42 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:42
It can be seen that the node is the master node, connected from a node has, from the IP node is 192.168.1.180, port 6379.
2. Check the node status
Excuting an order:
[root@centos-base system]# redis-cli -h 192.168.1.180 info Replication # Replication role:slave master_host:192.168.1.181 master_port:6379 master_link_status:up master_last_io_seconds_ago:3 master_sync_in_progress:0 slave_repl_offset:546 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:14e0a788c85de285ae34ab98f41893aaf097335a master_replid2:0000000000000000000000000000000000000000 master_repl_offset:546 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:546
It can be seen that the node is a slave node, the master node belonging to 192.168.1.181, the master node port 6379.
3. Data from the master operation
Setting a value in the master node:
[root@centos-base system]# redis-cli -h 192.168.1.181 -p 6379 192.168.1.181:6379> select 10 OK 192.168.1.181:6379[10]> set name helloworld OK
We set up a master node name value helloworld.
In the name of obtaining value from the node:
[root@centos-base system]# redis-cli -h 192.168.1.180 -p 6379 192.168.1.180:6379> select 10 OK 192.168.1.180:6379[10]> get name "helloworld"
It can be seen from the obtained value of the name of the node, as helloworld.
This shows that, after the master node intervening value, will automatically synchronize to the node .
When the master node survival, using interpolated values from the node:
192.168.1.180:6379[10]> set age 32 (error) READONLY You can't write against a read only replica.
We can see that in the survival of the master node, the node from the read-only (read only) a.