Shulou(Shulou.com)06/03 Report--

1. Install and configure Docker

Install Docker

First install the necessary dependency packages for Docker

[root@VM_1_64_centos ~] # cat / etc/redhat-release

CentOS Linux release 7.2.1511 (Core)

[root@VM_1_64_centos ~] #

[root@VM_1_64_centos ~] #

[root@VM_1_64_centos ~] #

[root@VM_1_64_centos ~] # yum install-y yum-utils device-mapper-persistent-data lvm2

Updated:

Device-mapper-persistent-data.x86_64 0RO 0.8.5-1.el7

Lvm2.x86_64 7vl 2.02.185-2.el7_7.2

Yum-utils.noarch 0VOR 1.1.31-52.el7

Dependency Updated:

Device-mapper.x86_64 7vl 1.02.158-2.el7_7.2

Device-mapper-event.x86_64 7vl 1.02.158-2.el7_7.2

Device-mapper-event-libs.x86_64 7vl 1.02.158-2.el7_7.2

Device-mapper-libs.x86_64 7vl 1.02.158-2.el7_7.2

Lvm2-libs.x86_64 7vl 2.02.185-2.el7_7.2

Python-urlgrabber.noarch 0RO 3.10-9.el7

Rpm.x86_64 0RO 4.11.3-40.el7

Rpm-build-libs.x86_64 0RO 4.11.3-40.el7

Rpm-libs.x86_64 0RO 4.11.3-40.el7

Rpm-python.x86_64 0RO 4.11.3-40.el7

Yum.noarch 0POS 3.4.3-163.el7.centos

Complete!

[root@VM_1_64_centos ~] #

Since we don't have Docker-CE with our own yum, we need to add docker repo first:

[root@VM_1_64_centos ~] # yum search all | grep docker

[root@VM_1_64_centos ~] #

[root@VM_1_64_centos ~] # yum-config-manager-- add-repo https://download.docker.com/linux/centos/docker-ce.repo

Loaded plugins: fastestmirror, langpacks

Adding repo from: https://download.docker.com/linux/centos/docker-ce.repo

Grabbing file https://download.docker.com/linux/centos/docker-ce.repo to / etc/yum.repos.d/docker-ce.repo

Repo saved to / etc/yum.repos.d/docker-ce.repo

[root@VM_1_64_centos ~] #

Install Docker with yum:

[root@VM_1_64_centos ~] # yum install-y docker-ce

Installed:

Docker-ce.x86_64 3Rank 19.03.4-3.el7

Dependency Installed:

Audit-libs-python.x86_64 0RO 2.8.5-4.el7

Checkpolicy.x86_64 0RO 2.5-8.el7

Container-selinux.noarch 2Vol 2.107-3.el7

Containerd.io.x86_64 0VOR 1.2.10-3.2.el7

Docker-ce-cli.x86_64 1Rank 19.03.4-3.el7

Libcgroup.x86_64 0RO 0.41-21.el7

Libseccomp.x86_64 0VR 2.3.1-3.el7

Libsemanage-python.x86_64 0RO 2.5-14.el7

Policycoreutils-python.x86_64 0RO 2.5-33.el7

Python-IPy.noarch 0RO 0.75-6.el7

Setools-libs.x86_64 0RO 3.3.8-4.el7

Dependency Updated:

Audit.x86_64 0RO 2.8.5-4.el7

Audit-libs.x86_64 0RO 2.8.5-4.el7

Libselinux.i686 0RO 2.5-14.1.el7

Libselinux.x86_64 0RO 2.5-14.1.el7

Libselinux-python.x86_64 0RO 2.5-14.1.el7

Libselinux-utils.x86_64 0RO 2.5-14.1.el7

Libsemanage.x86_64 0RO 2.5-14.el7

Libsepol.i686 0RO 2.5-10.el7

Libsepol.x86_64 0RO 2.5-10.el7

Policycoreutils.x86_64 0RO 2.5-33.el7

Selinux-policy.noarch 0VOR 3.13.1-252.el7.1

Selinux-policy-targeted.noarch 0VOR 3.13.1-252.el7.1

Complete!

View the version after successful installation

[root@VM_1_64_centos] # docker-v

Docker version 19.03.4, build 9013bf583a

[root@VM_1_64_centos ~] #

Set Boot self-boot

[root@VM_1_64_centos ~] # systemctl enable docker.service

Created symlink from / etc/systemd/system/multi-user.target.wants/docker.service to / usr/lib/systemd/system/docker.service.

[root@VM_1_64_centos ~] #

Configure Docker

Because domestic access to Docker Hub is slow, you can use the domestic image source provided by Tencent Cloud to accelerate access to Docker Hub.

Execute the following commands in turn

[root@VM_1_64_centos ~] # echo "OPTIONS='--registry-mirror= https://mirror.ccs.tencentyun.com'" > > / etc/sysconfig/docker

[root@VM_1_64_centos ~] # cat / etc/sysconfig/docker

OPTIONS='--registry-mirror= https://mirror.ccs.tencentyun.com'

[root@VM_1_64_centos ~] #

Reboot the modified daemon

[root@VM_1_64_centos ~] # systemctl daemon-reload

[root@VM_1_64_centos ~] # systemctl restart docker

[root@VM_1_64_centos ~] #

[root@VM_1_64_centos ~] # systemctl status docker

● docker.service-Docker Application Container Engine

Loaded: loaded (/ usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)

Active: active (running) since Tue 2019-11-12 18:32:11 CST; 7s ago

Docs: https://docs.docker.com

Main PID: 9286 (dockerd)

Memory: 41.1M

CGroup: / system.slice/docker.service

└─ 9286 / usr/bin/dockerd-H fd://-- containerd=/run/containerd/cont...

Nov 12 18:32:10 VM_1_64_centos dockerd [9286]: time= "2019-11-12T18:32:10.2274...c"

Nov 12 18:32:10 VM_1_64_centos dockerd [9286]: time= "2019-11-12T18:32:10.2274...c"

Nov 12 18:32:10 VM_1_64_centos dockerd [9286]: time= "2019-11-12T 18 purl 32 purl 10.4271..."

Nov 12 18:32:10 VM_1_64_centos dockerd [9286]: time= "2019-11-12T 18 purl 32 purl 10.8039..."

Nov 12 18:32:10 VM_1_64_centos dockerd [9286]: time= "2019-11-12T 18 purl 32 purl 10.9335..."

Nov 12 18:32:10 VM_1_64_centos dockerd [9286]: time= "2019-11-12T18:32:10.9419...2"

Nov 12 18:32:10 VM_1_64_centos dockerd [9286]: time= "2019-11-12T18:32:10.9421...4"

Nov 12 18:32:10 VM_1_64_centos dockerd [9286]: time= "2019-11-12T 18 purl 32 purl 10.9422..."

Nov 12 18:32:11 VM_1_64_centos systemd [1]: Started Docker Application Contai....

Nov 12 18:32:11 VM_1_64_centos dockerd [9286]: time= "2019-11-12T 18 purl 32 purl 11.1588..."

Hint: Some lines were ellipsized, use-l to show in full.

[root@VM_1_64_centos ~] #

Simple operation of 2.Docker

Download the image

Download an official CentOS image to local

[root@VM_1_64_centos ~] # docker pull centos

Using default tag: latest

Latest: Pulling from library/centos

729ec3a6ada3: Pull complete

Digest: sha256:f94c1d992c193b3dc09e297ffd54d8a4f1dc946c37cbeceb26d35ce1647f88d9

Status: Downloaded newer image for centos:latest

Docker.io/library/centos:latest

The downloaded image will appear in the image list.

[root@VM_1_64_centos ~] # docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

Centos latest 0f3e07c0138f 5 weeks ago 220MB

Run the container

At this point, we can operate in the container generated by the CentOS image we just downloaded.

Generate a container with a centos image as a template and use bash shell

[root@VM_1_64_centos ~] # docker run-it centos / bin/bash

[root@649840f41e77 /] #

At this point, you can see that the front end of the command line has changed to [root@ (a string of hash Id)], which indicates that we have successfully entered the CentOS container.

Execute any command in the container without affecting the host, as follows

[root@649840f41e77 /] # mkdir-p / data/simple_docker

[root@649840f41e77 /] #

You can see that the simple_docker folder has been created successfully under the / data directory

[root@649840f41e77 /] # ls-l / data

Total 4

Drwxr-xr-x 2 root root 4096 Nov 12 10:34 simple_docker

[root@649840f41e77 /] #

Exit the container

[root@649840f41e77 /] # exit

Exit

[root@VM_1_64_centos ~] #

Check the / data directory of the host, and there is no simple_docker folder, indicating that the operations in the container will not affect the host.

[root@VM_1_64_centos ~] # ll / data

Total 0

[root@VM_1_64_centos ~] #

Save Container

Check all the container information and get the id of the container.

[root@VM_1_64_centos] # docker ps-a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

649840f41e77 centos "/ bin/bash" 2 minutes ago Exited (0) 58 seconds ago vigorous_banach

[root@VM_1_64_centos ~] #

Then execute the following command

, save the image:

[root@VM_1_64_centos ~] # docker commit-m = "test container 20191112" 649840f41e77

Sha256:92bf635d09941b79558c62c1940ed4a707091d83d26595624cf8bb62b69e28e3

[root@VM_1_64_centos ~] # docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

92bf635d0994 3 seconds ago 220MB

Centos latest 0f3e07c0138f 5 weeks ago 220MB

[root@VM_1_64_centos ~] #

It is built like a tag.

[root@VM_1_64_centos ~] # docker tag 92bf635d0994 centos02

[root@VM_1_64_centos ~] # docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

Centos02 latest 92bf635d0994 48 seconds ago 220MB

Centos latest 0f3e07c0138f 5 weeks ago 220MB

[root@VM_1_64_centos ~] #

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