Location>code7788 >text

centos7 install docker detailed tutorials

Popularity：270 ℃/2024-08-14 14:17:50

I. Preparatory work

1. System requirements

docker requires centos to have a kernel version of no less than 3.10. centos7 meets the minimum kernel requirements.

Check the current kernel version
[root@zspc /]# uname -r
3.10.0-1160.el7.x86_64

You can see that my current kernel version is 3.10, which meets the minimum kernel requirements.

2. Uninstall the old version

You need to uninstall Docker if it was previously installed.

Just execute the following command:

yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-selinux \
                  docker-engine-selinux \
                  docker-engine \
                  docker-ce

Second, install Docker

1、Installation of dependency packages

yum install -y yum-utils \
           device-mapper-persistent-data \
           lvm2 --skip-broken

2、Update the local mirror source

For domestic network reasons, we use Ali's docker source here

# set updockermirror (computing)
yum-config-manager \
    --add-repo \
    /docker-ce/linux/centos/
    
sed -i 's//\/docker-ce/g' /etc//

yum makecache fast

3. Install Docker

yum install docker-ce docker-ce-cli

Select y if prompted during installation.

4、Verify whether the installation is successful

[root@zspc /]# docker -v
Docker version 26.1.4, build 5650f9b

III. Starting Docker

Normally, all you need to do to start Docker is turn off the firewall, but this is extremely insecure behavior, so to run Docker with the firewall enabled, configure the firewall to allow Docker-related traffic.

1. Check the firewall

Execute the following command to check the firewall status and you can see that the firewall is running

[root@zspc /]# systemctl status firewalld
●  - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2024-08-13 11:28:52 CST; 24h ago

2、Configure the firewall

Docker uses a network type called bridge, which needs to be turned on in the firewall.

firewall-cmd --permanent --zone=public --add-masquerade

Docker uses the 172.17.0.0/16 network segment by default, you need to open this segment in the firewall.

firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 4 -i docker0 -j ACCEPT

Reload the firewall to apply new rules

firewall-cmd --reload

4. Start Docker

systemctl start docker

Setting up boot-up

systemctl enable docker

Verify successful startup

Execute the docker ps command and the following result appears, which means that Docker has started successfully.

[root@zspc /]# docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
<Previous Next>