centos7安装docker攻略
1.确定linux发行版，比如centos7.6，那么在docker seache centos7.6查询一个系统镜像，下载安装
2.docker exec -i -t 进入容器，安装lnmp环境，导入代码，配置域名等，正常访问
3.docker commit 生成本地镜像
4.上传服务器
我们准备采用centos环境，因此我们先下载个centos镜像，docker search 搜一下都有哪些镜像，我们还可以用tag定义具体的哪个镜像版本，比如search的名字为docker.io/centos ，该镜像可能有多个版本，比如centos的不同版本。如果忽略tags选项，那么默认拉取最新版，如docker pull docker.io/centos:latest
[root@localhost ~]# docker search centos
INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED
docker.io docker.io/centos The official build of CentOS. 5945 [OK]
docker.io docker.io/ansible/centos7-ansible Ansible on Centos7 128 [OK]
docker.io docker.io/consol/centos-xfce-vnc Centos container with "headless" VNC sessi... 114 [OK]
docker.io docker.io/jdeathe/centos-ssh OpenSSH / Supervisor / EPEL/IUS/SCL Repos ... 114 [OK]
docker.io docker.io/centos/mysql-57-centos7 MySQL 5.7 SQL database server 74
docker.io docker.io/imagine10255/centos6-lnmp-php56 centos6-lnmp-php56 58 [OK]
docker.io docker.io/tutum/centos Simple CentOS docker image with SSH access 45
docker.io docker.io/centos/postgresql-96-centos7 PostgreSQL is an advanced Object-Relationa... 43
docker.io docker.io/centos/python-35-centos7 Platform for building and running Python 3... 38
docker.io docker.io/kinogmt/centos-ssh CentOS with SSH 29 [OK]
docker.io docker.io/pivotaldata/centos-gpdb-dev CentOS image for GPDB development. Tag nam... 11
docker.io docker.io/guyton/centos6 From official centos6 container with full ... 10 [OK]
docker.io docker.io/nathonfowlie/centos-jre Latest CentOS image with the JRE pre-insta... 8 [OK]
docker.io docker.io/drecom/centos-ruby centos ruby 6 [OK]
docker.io docker.io/pivotaldata/centos Base centos, freshened up a little with a ... 4
docker.io docker.io/darksheer/centos Base Centos Image -- Updated hourly 3 [OK]
docker.io docker.io/mamohr/centos-java Oracle Java 8 Docker image based on Centos 7 3 [OK]
docker.io docker.io/pivotaldata/centos-gcc-toolchain CentOS with a toolchain, but unaffiliated ... 3
docker.io docker.io/pivotaldata/centos-mingw Using the mingw toolchain to cross-compile... 3
docker.io docker.io/blacklabelops/centos CentOS Base Image! Built and Updates Daily! 1 [OK]
docker.io docker.io/indigo/centos-maven Vanilla CentOS 7 with Oracle Java Developm... 1 [OK]
docker.io docker.io/mcnaughton/centos-base centos base image 1 [OK]
docker.io docker.io/pivotaldata/centos6.8-dev CentosOS 6.8 image for GPDB development 0
docker.io docker.io/pivotaldata/centos7-dev CentosOS 7 image for GPDB development 0
docker.io docker.io/smartentry/centos centos with smartentry 0 [OK]
搜索指定版本的镜像并下载下来，然后run生成容器。
进入官网：Docker Hub
搜索centos的一个发行版镜像
单击centos镜像，查看镜像标签，这里我们下载标签名为centos7.6.1810的版本，命令为docker pull centos:centos7.6.1810,镜像名：标签名如果为latest，那么下载最新版本
docker search命令，也可以查询到镜像仓库的镜像名，但是看不到标签名，所以我们这里来官网看仓库中有哪些centos的版本。
[root@iZ5361zrqbnxubZ ~]# docker pull centos:centos7.6.1810
centos7.6.1810: Pulling from library/centos
Digest: sha256:0baec775bbf3e01cc770d5823c285b291b44ca05bb7c31b8674db5dae1d2aea9
Status: Image is up to date for centos:centos7.6.1810
[root@iZ5361zrqbnxubZ ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
runoob_new/centos dev_new 99eaded2c3f8 17 hours ago 191MB
runoob/centos dev 99eaded2c3f8 17 hours ago 191MB
runoobwyq/ubuntu v99 4006db595534 17 hours ago 137MB
httpd latest e77c77f17b46 8 days ago 140MB
nginx latest 719cd2e3ed04 9 days ago 109MB
centos 6.7 9f1de3c6ad53 3 months ago 191MB
centos centos6.7 9f1de3c6ad53 3 months ago 191MB
centos centos7.6.1810 f1cb7c7d58b7 3 months ago 202MB
centos latest 9f38484d220f 3 months ago 202MB
hello-world latest fce289e99eb9 5 months ago 1.84kB
ubuntu 15.10 9b9cb95443b5 2 years ago 137MB
training/webapp latest 6fae60ef3446 4 years ago 349MB
[root@iZ5361zrqbnxubZ ~]# docker run -d -it --privileged --name=centoslnmp centos:centos7.6.1810 /usr/sbin/init# 最简单的启动后进入运行状态的语句docker run -dit centos:centos7.6.1810，也就是docker run -dit 容器名:标签名，这里加入-d是守护进程。该-dit三个参数能保证该容器一直处于运行状态，中途可以使用docker stop或start或restart进行重启停止等，启动后都可以保持run状态。 新建一个容器，此时该容器会自动关闭，因为系统没有前台进程，docker会自动给你将其关闭，详细参见节点【Docker为什么刚运行就退出了?】，因此这里加入了/bin/bash -c 持续输出用于防止这种特性将容器关闭，方便后面使用exec -it 进入运行中的容器进行操作，exec不能进入关闭的容器。或者docker run -d -P --name centos7_lamp centos:centos7.6.1810 /bin/bash -c "while true; do echo hello world; sleep 100; done"
#如果要是用systemctl 管理服务就要加上参数 --privileged 来增加权，并且不能使用默认的/bin/bash，换成/usr/sbin/init。否则当你使用systectl start 服务名，开启一个服务会报错
#Failed to get D-Bus connection: Operation not permitted
89b91e2652c1b76e10a5e38ce43b772390d67b09f2426ccb79219931d747fdf1
[root@iZ5361zrqbnxubZ ~]# docker ps |grep centos
89b91e2652c1 centos:centos7.6.1810 "/bin/bash -c 'while…" 3 minutes ago Up 3 minutes centos7_lamp
[root@iZ5361zrqbnxubZ ~]# docker exec -it centos1 /bin/bash
[root@89b91e2652c1 ]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
安装nginx，修改自动开机启动，生成镜像，镜像文件，传输到另一个服务器，安装镜像。访问。
配置php和mysql
docker run -d -it --privileged --name=centoslnmp10 -p 8110:80 centos7:n /bin/bash systemctl start nginx
docker run -d --name=centoslnmp10 -p 8110:80 centos7:n /bin/bash systemctl start nginx
systemctl status nginx
docker exec -it centoslnmp14 /bin/bash
docker run -d --name=centoslnmp14 -p 8112:80 centos7:n /usr/sbin/nginx start
