Deploy Docker and configure Nginx in CentOS

What is Docker#

• Docker is a piece of software used for software publishing and a tool;
• Used to package the software operating environment and software developed based on the operating environment;
• The packaged operating environment (ie system) and the things generated by the software developed based on the operating environment are called images, which are similar to the GHO, ISO and other system images we used to install the windows system;
• Run in the container, Container is managed by docker;
• The relationship between Container and image is like the relationship between fish tank and fish, image is fish, container is fish tank;
• The linux basic image is much smaller than the normal linux system, because docker officially streamlined the mainstream linux system, leaving only the necessary things to make the system very pure;

View system version

[ root@dc02 ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511(Core)

View kernel version

[ root@dc02 ~]# uname -r
3.10.0- 327. el7.x86_64

Turn off selinux and firewall

setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#'/etc/selinux/config
systemctl disable firewalld.service
systemctl stop firewalld.service

Deploy Docker

Download docker

[ root@dc02 ~]# yum install -y docker

Replace domestic accelerator

[ root@dc02 ~]# cat >/etc/docker/daemon.json <<EOF
>{>" registry-mirrors":["https://docker.mirrors.ustc.edu.cn"]>}> EOF
[ root@dc02 ~]# cat /etc/docker/daemon.json 
{" registry-mirrors":["https://docker.mirrors.ustc.edu.cn"]}

Loading takes effect

[ root@dc02 ~]# systemctl daemon-reload 

Set up auto-start

[ root@dc02 ~]# systemctl enable docker
[ root@dc02 ~]# systemctl start docker

View status

[ root@dc02 ~]# systemctl status docker

Make mirror

Download the official centos mirror

[ root@dc02 ~]# docker pull centos
Using default tag: latest
Trying to pull repository docker.io/library/centos ... 
latest: Pulling from docker.io/library/centos
7 dc0dca2b151: Pull complete 
Digest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322
Status: Downloaded newer image for docker.io/centos:latest

View all download mirrors

[ root@dc02 ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
docker.io/centos    latest              49f7960eb7e4        7 weeks ago         200 MB

Boot and enter the mirror

[ root@dc02 ~]# docker run -it --name mynginx centos /bin/bash

Install common commands

[ root@9d76d200aae9 /]# yum install -y wget vim
[ root@9d76d200aae9 /]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
[ root@9d76d200aae9 /]#  wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

Install nginx

[ root@9d76d200aae9 /]# yum install -y nginx
# Docker prohibits running nginx in the background by default
[ root@9d76d200aae9 /]# vim /etc/nginx/nginx.conf
# in"user nginx;"Add a line below"daemon off;"

Check nginx configuration file syntax

[ root@9d76d200aae9 /]# nginx -t 

Start nginx

[ root@9d76d200aae9 /]# nginx    
The command line is built after startup, so open a new SSH connection to view the image

The command line is built after startup, so open a new SSH connection to view the mirror

[ root@dc02 ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
9 d76d200aae9        centos              "/bin/bash"14 minutes ago      Up 14 minutes                           mynginx

Submit mirror and view

[ root@dc02 ~]# docker commit -m "add new docker images" mynginx test/nginx:v1
sha256:5e28845136a33dc8e6175248086a90f9195dda4bdfc014a89b7ee32e37cc24d0
[ root@dc02 ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED              SIZE
test/nginx          v1                  5e28845136a3        About a minute ago   420 MB
docker.io/centos    latest              49f7960eb7e4        7 weeks ago          200 MB

Test nginx connectivity

Test nginx connectivity
[ root@dc02 ~]# docker run -p 80:80--name test_nginx 5e28845136a3 nginx

Browser access server IP address

As shown in the figure, the configuration is successful