How to install redis in CentOS7 and configure it to be accessible from the external network

1. Install gcc editor

Installing redis needs to rely on the gcc environment. Execute the following command to install:

yum install -y gcc

If the machine does not have a network, you can refer to this article:

CentOS offline installation gcc environment (with installation package pictures and texts)

2. Download the redis installation package

redis official website: https://redis.io/download

Download Then upload it to CentOS, for example, upload it to /usr/local/

3, decompress and compile and install redis

command is as follows:

1, Enter the installation package directory

cd /usr/local/

2. Unzip the installation package

tar -zxvf  redis-6.2.1.tar.gz

3. Enter the decompressed redis directory and compile

cd redis-6.2.1

make

##4 , Install to the specified directory

Install redis to the specified directory, you can modify the path yourself, take

/usr/local/redis as an example:

make install prefix=/usr/local/redis

4. Start redis

There are two ways to start redis, one is to start the foreground interface, which will be closed as long as the interface is closed, and the other is to start the background.

4.1. Start the front-end interface

Enter the bin directory of the redis installation directory:

cd /usr/local/redis/bin

At this time, just execute the following command to start:

./redis-server

The startup screenshot is as follows:

The problem at this time is that we don’t know where the startup configuration file is...

In fact, we can directly pass Use the find command to check:

find / -name 'redis.conf'

The results are as follows:

The front-end startup method is not commonly used. As long as the interface is closed, redis will stop.

4.2. Start the background service

We copy a redis.conf file from the previously decompressed installation package to the redis installation directory.

cp /usr/local/redis-6.2.1/redis.conf /usr/local/redis/bin/

Then modify the thread mode parameters of the redis.conf configuration file:

vi /usr/local/redis/bin/redis.conf

PS: vi shortcut key, click

/, and then enter [keyword] Query parameters.

Main modifications

daemonizeThe corresponding value is yes

1、修改之前 
daemonize no 
2、修改之后
daemonize yes

Explanation of the value of this parameter:

• yes: redis The single-process multi-thread mode is adopted. Turning on daemon mode means when the daemonize option in the redis.conf file is set to "yes". In this mode, redis will run in the background and write the process pid number to the file set by the redis.conf option pidfile. At this time, redis will always run unless the process is manually killed.

• no: When the daemonize option is set to no, the current interface will enter the redis command line interface. Exit force exit or closing the connection tool (putty, xshell, etc.) will cause the redis process to exit. .

After modification, save and exit.

Execute the following command to start redis again:

./redis-server redis.conf

Now redis is started in the background.

5. Set external network access

The default configuration file does not support external network access. Next, modify the parameters for external network access.

Or modify the configuration file:

vi /usr/local/redis/bin/redis.conf

Find the following three parameters:

##bind 127.0.0.1 (bind the IP that allows access)
protected-mode yes (protected mode on)
#requirepass yourpassword (request access password)
The first and second items are combination items, which are particularly important. The third item is to set a password, which protects the service area to a certain extent.

is modified as follows:

bind 127.0.0.1

• ##protected-mode no

• requirepass Your password

• After modification, save and exit.

6. Register redis service

It is very troublesome to start and close redis every time. It is better to register it as a service directly.

Execute the following command to create the redis service:

vi /etc/systemd/system/redis.service

Add the following command:

[Unit]
Description=redis-server
After=network.target

[Service]
Type=forking
ExecStart=/usr/local/redis/bin/redis-server /usr/local/redis/bin/redis.conf
PrivateTmp=true

[Install]
WantedBy=multi-user.target

The ExecStart parameter corresponds to the installation of redis-server in the Redis directory, and the configuration file is the same as above.

Set up startup:

systemctl daemon-reload
systemctl start redis.service
systemctl enable redis.service

7. Common service commands

Start redis service

systemctl start redis.service

Stop redis service

systemctl stop redis.service

Restart Start the service

systemctl restart redis.service

View the current status of the service

systemctl status redis.service

Set auto-start at boot

systemctl enable redis.service

Stop auto-start at boot

systemctl disable redis.service

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