1. Installation environment instructions
System environment: centos6.6
Service has been applied: haproxy confd etcd docker
Host Name
dockerha-152 192.168.36.152 haproxy confd
dockerEtcd-153 192.168.36.153 etcd
dockermain-154 192.168.36.154 docker
2. Install the lazy package and close the conflicting services
The official documentation requires that Linux kernels be at least 3.8 or above, and docker can only run on 64-bit systems. Since RHEL6 and CentOS6 have kernel versions of 2.6, you must first upgrade the kernel.
cd /etc/ wget http:///yum/el6/ yum install kernel-ml-aufs kernel-ml-aufs-devel -y
Modify grub's main configuration file /etc/ and set default=0 to indicate that the content under the first title is the kernel launched by default (usually the newly installed kernel is in the first location).
Then restart and restart the system. At this time, your kernel will be successfully upgraded, and the version should be above 3.8.
uname -r [root@dockermain-154 shell]# uname -r
3.10.5-3.el6.x86_64
sed -i '/^SELINUX=/c\SELINUX=disabled' /etc/selinux/config setenforce 0
The docker-io package has been provided in the Fedora EPEL source. Download and install epel:
rpm -ivh /fedora-epel/6/x86_64/ sed -i 's/^mirrorlist=https/mirrorlist=http/' /etc//
3. Install components
(1)haproxy confd
Operation on dockerha-152
1、haproxy
# yum –y install haproxy
2、confd
# wget /kelseyhightower/confd/releases/download/v0.6.3/confd-0.6.3-linux-amd64 # mv confd /usr/local/bin/confd # chmod +x /usr/local/bin/confd # /usr/local/bin/confd -version
(2)etcd
Operation on dockerEtcd-153
# mkdir -p /home/install && cd /home/install # wget /coreos/etcd/releases/download/v0.4.6/etcd-v0.4. # tar -zxvf etcd-v0.4. # cd etcd-v0.4.6-linux-amd64 # cp etcd* /bin/ # /bin/etcd -version etcd version 0.4.6
(3)Docker
# yum -y install docker-io # service docker start # chkconfig docker on
4. Docker command
(1) View Help
docker COMMAND --help
(2) Search for available environment images
docker search name as example:
[root@dockermain-154 src]# docker search centos NAME DESCRIPTION STARS OFFICIAL AUTOMATED centos The official build of CentOS. 817 [OK] ansible/centos7-ansible Ansible on Centos7 30 [OK] tutum/centos Centos image with SSH access. For the root... 13 [OK] jdeathe/centos-ssh-apache-php CentOS-6 6.5 x86_64 / Apache / PHP / PHP m... 8 [OK] blalor/centos Bare-bones base CentOS 6.5 image 8 [OK] jprjr/centos-php-fpm 6 [OK] steeef/graphite-centos CentOS with Graphite and Carbon via ng... 6 [OK] tutum/centos-6.4 DEPRECATED. Use tutum/centos:6.4 instead. ... 5 [OK] layerworx/centos A general CentOS 6 image with the EPEL6 an... 2 [OK] jr42/chef-solo-centos Official CentOS base images with current c... 1 [OK] million12/centos-supervisor Base CentOS-7 with supervisord launcher, h... 1 [OK] internavenue/centos-percona Centos-based Percona image. 1 [OK] jdeathe/centos-ssh CentOS-6 6.5 x86_64 / EPEL Repo. / OpenSSH... 1 [OK] jdeathe/centos-ssh-mysql CentOS-6 6.5 x86_64 / MySQL. Image include... 1 [OK] yajo/centos-epel CentOS with EPEL and fully updated 1 [OK] nimmis/java-centos This is docker images of CentOS 7 with dif... 0 [OK] lighthopper/orientdb-centos A Dockerfile for creating an OrientDB imag... 0 [OK] bbrietzke/centos-starter CentOS 7 with EPEL and SupervisorD 0 [OK] tcnksm/centos-node Dockerfile for CentOS packaging node 0 [OK] insaneworks/centos CentOS 6.5 x86_64 + @update 0 [OK] snowyday/centos Provide for emacs and Ricty font on X11 en... 0 [OK] dmglab/centos CentOS with superpowers! 0 [OK] akroh/centos Centos 6 container that has been updated w... 0 [OK] timhughes/centos Centos with systemd installed and running 0 [OK] solict/provisionous-puppet-centos CentOS provisions with Puppet included 0 [OK]
(3) Download the mirror
Note that the image name must be written in full, which is the name of the NAME column searched with docker search name.
docker pull name As example:
[root@dockermain-154 src]# docker pull jdeathe/centos-ssh-apache-php Pulling repository jdeathe/centos-ssh-apache-php ........ 62203f428b1f: Download complete e1812755a4ca: Download complete 0910edda3736: Download complete Status: Downloaded newer image for jdeathe/centos-ssh-apache-php:latest
(4) View installed images
[root@dockermain-154 src]# docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE centos latest dade6cb4530a 10 days ago 210.1 MB jdeathe/centos-ssh-apache-php latest f1a489312a4a 3 months ago 297.7 MB
(5) Run commands in docker container
The docker run command has two parameters, one is the image name and the other is the command to be run in the image. Note: IMAGE=REPOSITORY[:TAG]. If the IMAGE parameter does not specify the mirrored TAG, the default TAG is latest.
[root@dockermain-154 run]# sudo docker run jdeathe/centos-ssh-apache-php echo 'hello world!' hello world! [root@dockermain-154 run]# sudo docker run jdeathe/centos-ssh-apache-php hostname db7e1d2269fb
(6) List containers
View the recently generated container: docker ps -l
View running container: docker ps
[root@dockermain-154 run]# docker ps -l CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES db7e1d2269fb jdeathe/centos-ssh-apache-php:latest "hostname" 27 seconds ago Exited (0) 26 seconds ago adoring_babbage
(7) Display container standard output
[root@dockermain-154 run]# docker ps -l CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES db7e1d2269fb jdeathe/centos-ssh-apache-php:latest "hostname" 27 seconds ago Exited (0) 26 seconds ago adoring_babbage [root@dockermain-154 run]# docker logs db7e1d2269fb db7e1d2269fb
(8) Install programs or services in the container
[root@dockermain-154 run]# sudo docker run centos yum install -y httpd Loaded plugins: fastestmirror ..........
Dependency Installed:
apr.x86_64 0:1.4.8-3.el7 apr-util.x86_64 0:1.5.2-6.el7 0:70.0.6-1. httpd-tools.x86_64 0:2.4.6-19. 0:2.1.41-2.el7
Failed:
httpd.x86_64 0:2.4.6-19.
Complete!
(9) Save changes to the container and generate a new image
docker commit CONTAINERID [REPOSITORY[:TAG]]
The REPOSITORY parameter can be the new image name or the old image name; if it is the same as the old image name and TAG, the old image will be overwritten.
[root@dockermain-154 ~]# docker commit bd7cc4f4ac92 centos:httpd 1e0915f3247b86414ebc11fd994fc6abfb590ff3b1ab890949c845ee88b2d9f4 [root@dockermain-154 ~]# docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE centos httpd 1e0915f3247b 9 seconds ago 320.8 MB centos latest dade6cb4530a 10 days ago 210.1 MB jdeathe/centos-ssh-apache-php latest f1a489312a4a 3 months ago 297.7 MB
(10) Stop running container
(11) View container or mirror details
Below is the new container I just saved the commit generated
[root@dockermain-154 ~]# docker inspect 943e45b6e5f3
[{
"AppArmorProfile": "",
"Args": [],
"Config": {
"AttachStderr": true,
"AttachStdin": true,
"AttachStdout": true,
"Cmd": [
"/bin/bash"
],
"CpuShares": 0,
"Cpuset": "",
"Domainname": "",
"Entrypoint": null,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"ExposedPorts": null,
"Hostname": "943e45b6e5f3",
"Image": "centos:httpd",
"MacAddress": "",
"Memory": 0,
"MemorySwap": 0,
"NetworkDisabled": false,
"OnBuild": null,
"OpenStdin": true,
"PortSpecs": null,
"StdinOnce": true,
"Tty": true,
"User": "",
"Volumes": null,
"WorkingDir": ""
},
(12) Delete the container
docker rm CONTAINERID
View all container IDs: docker ps -a -q
Delete all containers: docker rm $(docker ps -a -q)
(13) Delete the mirror
docker rmi IMAGE
(14) Check the docker information, including the number of Containers and Images, kernel version, etc.
[root@dockermain-154 ~]# docker info Containers: 14 Images: 56 Storage Driver: aufs Root Dir: /var/lib/docker/aufs Dirs: 89 Execution Driver: native-0.2 Kernel Version: 3.10.5-3.el6.x86_64 Operating System: <unknown> CPUs: 1 Total Memory: 989.6 MiB Name: dockermain-154 ID: W4PW:W3XR:FQZE:SBAA:2DS2:BM6N:DV5B:ARF2:3SZM:XGST:5ZF7:DFZV WARNING: No swap limit support
(15) Create a container and use it like the usual ssh login
[root@dockermain-154 ~]# docker run -i -t centos /bin/bash [root@7c0414d03fe7 /]# ls bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin selinux srv sys tmp usr var
The above is a detailed tutorial on deploying and maintaining the docker environment introduced by the editor. I hope it will be helpful to everyone. If you have any questions, please leave me a message and the editor will reply to everyone in time. Thank you very much for your support for my website!