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

A brief introduction to Docker

II. Docker installation

[root@lamp sky9890] # yum install docker

[root@lamp sky9890] # systemctl start docker.service # start the Docker service

[root@lamp sky9890] # systemctl enable docker.service # automatically loads when the system starts

[root@lamp sky9890] # docker # View docker client

[root@lamp sky9890] # docker-v # version

Docker version 1.13.1, build 4ef4b30/1.13.1

3. Obtain an image

An image is a template that can be obtained from the image server. Docker uses the docker pull command to get the desired image.

Don't get centos, ubuntu, tomcat, nginx, mysql, mongo and other images.

1. Find the available nginx image version from docker image to get the image

[root@lamp sky9890] # docker search centos

[root@lamp sky9890] # docker search ubuntu

[root@lamp sky9890] # docker search tomcat

[root@lamp sky9890] # docker search nginx

two。 Download the required version from the docker image

[root@lamp sky9890] # docker pull centos

[root@lamp sky9890] # docker pull mysql

[root@lamp sky9890] # docker pull tomcat

[root@lamp sky9890] # docker pull mysql:latest

[root@lamp sky9890] # docker pull python:3.5

[root@lamp sky9890] # docker pull mongo:latest

3. Show images that have been downloaded locally

[root@lamp sky9890] # docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

Docker.io/tomcat latest 4e7840b49fad 3 days ago 529 MB

Docker.io/nginx latest a1523e859360 4 days ago 127 MB

Docker.io/python 3.5 0320ef7199ca 4 days ago 909 MB

Docker.io/mysql latest c8ad2be69a22 4 days ago 465 MB

Docker.io/php latest e66ae809d99a 4 days ago 405 MB

Docker.io/httpd latest c5a012f9cf45 4 days ago 165 MB

Docker.io/mongo latest bcef5fd2979d 9 days ago 386 MB

Docker.io/ubuntu latest 72300a873c2c 9 days ago 64.2 MB

Docker.io/centos latest 470671670cac 6 weeks ago 237 MB

Third, how to use the container

1. Use the docker run command to run an application inside the container.

[root@lamp sky9890] # docker run ubuntu / bin/echo "Hello World"

Hello World

two。 Run a switched container

[root@lamp sky9890] # docker run-I-t ubuntu / bin/bash

Root@1c7c38a6f99a:/#

Root@1c7c38a6f99a:/# cat / proc/version

Linux version 3.10.0-862.11.6.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC)) # 1

SMP Tue Aug 14 21:49:04 UTC 2018

Root@1c7c38a6f99a:/# ls

Bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var

Root@1c7c38a6f99a:/usr# exit

Exit

3. Start the container (background mode)

[root@lamp sky9890] # docker run-d ubuntu / bin/sh-c "while true;do echo hello world; sleep 1; done"

1f77ab03073f192d18737110bf97ec04b72524fb34e3a570571d4cac6b4e5b31

4. View docker processes

[root@lamp sky9890] # docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

1f77ab03073f ubuntu "/ bin/sh-c 'while..." 38 seconds ago Up 36 seconds competent_ramanujan

8778ad75ade3 ubuntu "/ bin/bash" 14 minutes ago Up 14 minutes ubuntu-test

7757db1528de ubuntu "/ bin/bash" 19 minutes ago Up 15 minutes distracted_austin

Description of output details:

CONTAINER ID: container ID.

IMAGE: the image used.

COMMAND: the command that runs when the container is started.

CREATED: the time when the container was created.

STATUS: container status.

There are 7 states:

Created (created)

Restarting (restarting)

Running (running)

Removing (migrating)

Paused (pause)

Exited (stop)

Dead (death)

PORTS: the port information of the container and the connection type used (tcp\ udp).

NAMES: automatically assigned container name.

5. View the standard output of the container

[root@lamp sky9890] # docker logs 1f77ab03073f

Hello world

Hello world

.

6. Stop the container

[root@lamp sky9890] # docker stop 1f77ab03073f

1f77ab03073f

[root@lamp sky9890] # docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

8778ad75ade3 ubuntu "/ bin/bash" 18 minutes ago Up 17 minutes ubuntu-test

7757db1528de ubuntu "/ bin/bash" 22 minutes ago Up 18 minutes distracted_austin

7. Delete Container

[root@lamp sky9890] # docker rm-f 1f77ab03073f

IV. Installation of Docker instance

1.Docker install CentOS

[root@lamp sky9890] # docker run-itd-name centos-test centos

F2896d1d87c996685c7c98fb9c85241a10483fb1f2dcd843a4b0d6cab212d636

# run the container through exec

[root@lamp sky9890] # docker exec-it centos-test / bin/bash

[root@f2896d1d87c9 /] # exit

[root@lamp sky9890] # docker ps # installed successfully

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

F2896d1d87c9 centos "/ bin/bash" About a minute ago Up About a minute centos-test

8778ad75ade3 ubuntu "/ bin/bash" 34 minutes ago Up 34 minutes ubuntu-test

7757db1528de ubuntu "/ bin/bash" 39 minutes ago Up 35 minutes distracted_austin

2.Docker install nginx

# run the container

[root@lamp sky9890] # docker run-- name nginx-test-p 8080 nginx 80-d nginx

5f4aa091f8244b4f21a585b8426240218312b90f46dc23f8cfdc825f1a981b6e

Parameter description:

-- name nginx-test: container name.

-p 8080 rig 80: Port mapping, mapping local port 8080 to port 80 inside the container.

-d nginx: sets the container to run all the time in the background.

test

5. Related operations in the container

1. Start the CentOS container

[root@lamp sky9890] # docker run-it centos / bin/bash

[root@b90d59c23a38 /] # lsb_release

Bash: lsb_release: command not found

[root@b90d59c23a38 /] # yum install redhat-lsb-y

[root@b90d59c23a38 /] # lsb_release-a

LSB Version:: core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-

Amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch

Distributor ID: CentOS

Description: CentOS Linux release 8.1.1911 (Core)

Release: 8.1.1911

Codename: Core

two。 Start the Ubuntu container

Root@737d61040022:/# lsb-release-a

Bash: lsb-release: command not found

Root@737d61040022:/# apt-get install lsb-release

Reading package lists... Done

Building dependency tree

Reading state information... Done

E: Unable to locate package lsb-release

# the above reasons indicate that the APT library needs to be updated

Root@737d61040022:/# apt-get update

Reading package lists... Done

E: Could not get lock / var/lib/apt/lists/lock-open (11: Resource temporarily unavailable)

E: Unable to lock directory / var/lib/apt/lists/

# the above reason is due to the fact that the resource is locked, which may be caused by the failure to complete the last installation. The following two commands need to be executed:

Root@737d61040022:/# rm / var/cache/apt/archives/lock

Root@737d61040022:/# rm / var/lib/apt/lists/lock

Root@737d61040022:/# apt-get update # updates the software list

Root@737d61040022:/# apt-get upgrade # update software

Root@737d61040022:/# apt-get install lsb-release

Reading package lists... Done

.

Root@737d61040022:/# lsb_release-a

No LSB modules are available.

Distributor ID: Ubuntu

Description: Ubuntu 18.04.4 LTS

Release: 18.04

Codename: bionic

Root@737d61040022:/# apt-get install lsb-core

6. Solve the problem of slow docker pull

# add the following parameters to the vi / etc/docker/daemon.json file (create a new one without this file):

{

"registry-mirrors": ["https://9cpn8tt6.mirror.aliyuncs.com"]"

}

# systemctl daemon-reload

# systemctl restart docker

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