Centos7 deployment sentry redis (with architecture diagram, clear and easy to understand)

1 origin

From the last article How to use it correctly Vertx operation Redis（3.9.4 With source code analysis ） Speaking of ,
This article shares Vert.x Connect and operate Redis, It introduces monomer Redis And clusters rRedis The connection and operation of ,
Because of monomer Redis And clusters Redis The previous experiments have been completed （Ubuntu20.04）, It can be used directly , however , Sentinel's Redis No building , therefore , Only connection and operation codes can be given , No test is given ,
therefore , Over the weekend （ It's raining , The typhoon “ Siemba ”[xiān bā] Attack ） In the way of setting up sentinels on experimental machines Redis colony ,
Test sentinel mode Vert.x Connect and operate Redis, Improve the previous article ,
Because the experimental machine is CentOS7 The system of ,
Deploy Sentinel Redis It took some time , There is still reference value ,
Share as follows .

2 Get ready

The overall structure is shown in the figure below , It can be seen from the picture that , sentry 3 individual , Form a sentinel cluster ; node 3 individual , One master node and two slave nodes . The sentinel monitors the running status of the node cluster , And instantly switch Services , Guarantee Redis Normal operation .

2.1 Compile environment

CentOS7 default gcc Version is 4.8.5, see gcc command ：gcc -v, The results are shown in the following figure ：

The version gcc Can't compile Redis6.0.6, So it needs to be upgraded gcc, Use the following command ：

#  Software set （Software collections）
yum -y install centos-release-scl
# gcc And tool set 
sudo yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
#  Enable gcc
scl enable devtoolset-9 bash

After installation gcc edition , As shown in the figure below ：

2.2 Redis Get ready

This article USES the Redis6.0.6, The version Redis Sentinel and cluster deployment can be realized .

Download address ：http://download.redis.io/releases/redis-6.0.6.tar.gz

2.3 compile Redis

decompression Redis To directory , Such as ：/home/xindaqi/install/redis

tar -zxvf redis-6.0.6.tar.gz -C /home/xindaqi/install/redis

Get into redis-6.0.6 Folder , compile Redis, command ：make,
As shown in the figure below ：

thus , complete Redis compile ,
The environment is ready .

3 To configure

In sentinel mode , Configure three Redis node （ Virtual node ）, therefore , It consists of one master node and two slave nodes ,
Compile the above Redis Copy three copies , Store to path ：/home/xindaqi/install/redis/sentinel,
Name it 9001,9002,9003, Long like this ：

among ,9001 Master node ,9002 and 9003 As a slave node .
Node information is as follows ：

Serial number	node IP	port	describe
1	192.168.1.12	9001	Master node
2	192.168.1.12	9002	From the node
3	192.168.1.12	9003	From the node

The sentry information is as follows ：

Serial number	node IP	port	describe
1	192.168.1.12	26379	sentry 1
2	192.168.1.12	26380	sentry 2
3	192.168.1.12	26381	sentry 3

3.1 Node configuration

3.1.1 Master node

Modify in the master node Redis To configure ：redis.conf,
The changes are as follows ：

#  notes IP binding ,Redis Service for all IP to open up 
# bind 127.0.0.1 ::1
#  Turn off protection mode , all IP Accessible Redis Server side 
protected-mode no
# Redis Service port 
port 9001
#  The daemons run Redis Server side 
daemonize yes
# pid file ：9001
pidfile /var/run/redis_9006.pid
#  Log files :9001
logfile /home/xindaqi/project/logs/redis-9001.log

3.1.2 From the node

The slave node configuration information is as follows ：redis.conf,
Different from the master node , The slave node needs to configure the master node partition information （replicaof）, For synchronizing data and delivering messages .

• From the node 1
  Port usage 9002.

#  notes IP binding ,Redis Service for all IP to open up 
# bind 127.0.0.1 ::1
#  Turn off protection mode , all IP Accessible Redis Server side 
protected-mode no
# Redis Service port 
port 9002
#  The daemons run Redis Server side 
daemonize yes
# pid file ：9001
pidfile /var/run/redis_9006.pid
#  Log files :9001
logfile /home/xindaqi/project/logs/redis-9002.log
#  Master node replica ： Synchronize the data of the master node to the slave node 
replicaof 192.168.1.12 9001

• From the node 2
  Port usage 9003.

#  notes IP binding ,Redis Service for all IP to open up 
# bind 127.0.0.1 ::1
#  Turn off protection mode , all IP Accessible Redis Server side 
protected-mode no
# Redis Service port 
port 9003
#  The daemons run Redis Server side 
daemonize yes
# pid file ：9001
pidfile /var/run/redis_9006.pid
#  Log files :9001
logfile /home/xindaqi/project/logs/redis-9003.log
#  Master node replica ： Synchronize the data of the master node to the slave node 
replicaof 192.168.1.12 9001

3.1.3 Start the master-slave service

After configuration , Next, you can start the master-slave service , Check out the information .
Use Shell The script starts the service , The contents are as follows ：

echo "Starting Redis master and slave"
cd /home/xindaqi/install/redis/sentinel
9001/src/redis-server 9001/redis.conf
9002/src/redis-server 9002/redis.conf
9003/src/redis-server 9003/redis.conf
echo "Redis master and slave is started!!!"

3.1.4 Node information

• Get into Redis Master node ：

src/redis-cli -h 192.168.1.12 -p 9001

• View node information
  Node information includes the number of slave nodes 、 From the node IP and Port etc. .

info replication

• Enter from node

src/redis-cli -h 192.168.1.12 -p 9002

• View slave node information
  View the master node information from the node , Such as IP and Port And the working state of the main node ：UP perhaps DOWN.

info replication

3.2 Sentinel configuration

After completing node configuration , Next, you need to configure sentinels ,
this paper , Sentinels also use clusters （ fictitious ） The way ,
Configure three sentinel nodes , It can be seen from the above ,Redis6.0.6 Support sentry and cluster configuration , therefore ,
You can directly modify the sentry's configuration file ：sentinel.conf.

3.2.1 sentinel

Sentinel configuration , The core is to configure the port of the sentry and the master node for monitoring ,
adopt sentinel monitor mymaster 192.168.1.12 9001 2 Monitor master , And name the main node ,
Yes , The name of the master node is actually configured in the sentinel ,
because , The client connection is through the sentinel .

• sentry -1

#  The port where the sentry runs 
port 26379
#  The daemons run 
daemonize yes
#  Process documents 
pidfile "/var/run/redis-sentinel-26379.pid"
#  Log location 
logfile "/home/xindaqi/project/logs/sentinel-26379.log"
#  Main node information monitored by sentry 
# mymaster： Master node name 
# 192.168.1.12： Master node IP
# 9001： Master node Port
# 2： Identify the number of sentinels at the primary node , If the number of sentinels reaches this number, it is determined that the primary node is lost , Then it is determined that the primary node is objectively disconnected 
sentinel monitor mymaster 192.168.1.12 9001 2

• sentry -2

#  The port where the sentry runs 
port 26380
#  The daemons run 
daemonize yes
#  Process documents 
pidfile "/var/run/redis-sentinel-26380.pid"
#  Log location 
logfile "/home/xindaqi/project/logs/sentinel-26380.log"
#  Main node information monitored by sentry 
# mymaster： Master node name 
# 192.168.1.12： Master node IP
# 9001： Master node Port
# 2： Identify the number of sentinels at the primary node , If the number of sentinels reaches this number, it is determined that the primary node is lost , Then it is determined that the primary node is objectively disconnected 
sentinel monitor mymaster 192.168.1.12 9001 2

• sentry -3

#  The port where the sentry runs 
port 26381
#  The daemons run 
daemonize yes
#  Process documents 
pidfile "/var/run/redis-sentinel-26381.pid"
#  Log location 
logfile "/home/xindaqi/project/logs/sentinel-26381.log"
#  Main node information monitored by sentry 
# mymaster： Master node name 
# 192.168.1.12： Master node IP
# 9001： Master node Port
# 2： Identify the number of sentinels at the primary node , If the number of sentinels reaches this number, it is determined that the primary node is lost , Then it is determined that the primary node is objectively disconnected 
sentinel monitor mymaster 192.168.1.12 9001 2

3.2.2 Activate the sentry

After completing the sentry configuration , Next, start the sentry , Also use Shell perform ,
Shell The script is as follows ：

echo "Starting Redis sentinel"
cd /home/xindaqi/install/redis/sentinel
9001/src/redis-sentinel 9001/sentinel.conf
9002/src/redis-sentinel 9002/sentinel.conf
9003/src/redis-sentinel 9003/sentinel.conf
echo "Redis sentinel is started!!!"

3.2.3 Check the sentry information

• Enter the sentry

src/redis-cli -h 192.168.1.12 -p 26379

• Check the information
  View the master node information in the current cluster through the sentry 、 Number of slave nodes and sentinels , As shown in the figure below .

info sentinel

3.3 port configuration

because CentOS7 The default firewall is on , By default, all ports are closed ,
therefore , Deployed services need to expose ports , You need to open ports one by one ,
The ports that need to be opened here are ：26379、26380、26381、9001、9002 and 9003.
With 26379 Port as an example ：

#  Open port 
sudo firewall-cmd --zone=public --add-port=26379/tcp --permanent
#  Port validation 
sudo firewall-cmd --reload

4 Summary

The core ：
（1） Environmental preparation ：gcc upgrade ,Redis compile ;
（2） Configuration node ： Master and slave nodes ;
（3） Deploy sentinels ： Listen to the master node , Configure master node name ;
（4） Open ports ：CentOS7 Default off Port , therefore , You need to open all ports of sentinels and nodes .

Q&A

error: ‘struct redisServer’ has no member named ‘aof_rewrite_perc’
CentOS7 Default

gcc -v

Improve gcc edition , Install the following plug-ins ：

#  Software set （Software collections）
yum -y install centos-release-scl
# gcc And tool set 
sudo yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
#  Enable gcc
scl enable devtoolset-9 bash