今天小编给大家分享一下ECS如何部署Docker服务的相关知识点,内容详细,逻辑清晰,相信大部分人都还太了解这方面的知识,所以分享这篇文章给大家参考一下,希望大家阅读完这篇文章后有所收获,下面我们一起来了解一下吧。
京东2016年618大促,全部应用系统和大部分的DB服务都跑在Docker上。据官方估计,本次大促活动中,京东线上将会启动近15万个Docker容器,从数量上来看,京东是全球范围内Docker的应用大户之一。
官方文档要求Linux kernel至少3.8以上,且docker只能运行在64位的系统中。由于RHEL6和CentOS6的内核版本为2.6,因此必须要先升级内核。
首先,查看阿里云ECS Linux服务器系统内核版本:
$uname -r 2.6.32-220.23.2.ali878.el6.x86_64
由于当前内核版本较低,我们需要把系统内核升级到3.10版本,接下来为具体操作步骤:
(1). yum安装带aufs模块的3.10内核
[dddd@v069208183.sqa.zmf /home/dddd] $cd /etc/yum.repos.d $sudo wget http://www.hop5.in/yum/el6/hop5.repo $sudo yum install kernel-ml-aufs kernel-ml-aufs-devel
(2). 下载内核
(3). 安装内核
(4). 安装成功
(5). 修改内核配置
修改grub的主配置文件/etc/grub.conf,设置default=0,表示第一个title下的内容为默认启动的kernel(一般新安装的内核在第一个位置)
[dddd@v069208183.sqa.zmf /etc/yum.repos.d] $sudo vi /etc/grub.conf
(6). 重启系统
[dddd@v069208183.sqa.zmf /etc/yum.repos.d] $sudo reboot Broadcast message from dddd@v069208183.sqa.zmf (/dev/pts/1) at 18:32 ... The system is going down for reboot NOW!
这时候你的内核就成功升级了
[dddd@v069208183.sqa.zmf /home/admin/ $uname -r 3.10.5-3.el6.x86_64
查看内核是否支持aufs:
[dddd@v069208183.sqa.zmf /home/admin/] $grep aufs /proc/filesystems nodev aufs
[dddd@v069208183.sqa.zmf /home/admin/] $sudo setenforce 0 setenforce: SELinux is disabled [dddd@v069208183.sqa.zmf /home/admin/] $sudo sed -i '/^SELINUX=/c\SELINUX=disabled' /etc/selinux/config
[dddd@v069208183.sqa.zmf /] $sudo rpm -ivh http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm Retrieving http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm warning: /var/tmp/rpm-tmp.NNZYOY: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY Preparing... ########################################### [100%] 1:epel-release ########################################### [100%] [dddd@v069208183.sqa.zmf /] $sudo sed -i 's/^mirrorlist=https/mirrorlist=http/' /etc/yum.repos.d/epel.repo
[dddd@v069208183.sqa.zmf /] $sudo yum -y install docker-io
安装成功:
启动的过程中有点小插曲,第一次启动失败。
[dddd@v069208183.sqa.zmf /] $sudo service docker start Starting cgconfig service: [ OK ] Starting docker: [ OK ] [dddd@v069208183.sqa.zmf /] $docker version Client version: 1.7.1 Client API version: 1.19 Go version (client): go1.4.2 Git commit (client): 786b29d/1.7.1 OS/Arch (client): linux/amd64 Get http:///var/run/docker.sock/v1.19/version: dial unix /var/run/docker.sock: permission denied. Are you trying to connect to a TLS-enabled daemon without TLS?
上面看似启动成功,其实是失败了,查看docker日志即可,docker日志地址为/var/log/docker:
$cat /var/log/docker \nSat Jun 25 18:54:55 CST 2016\n time="2016-06-25T18:54:56.013084200+08:00" level=info msg="Listening for HTTP on unix (/var/run/docker.sock)" time="2016-06-25T18:54:56.206980482+08:00" level=warning msg="Running modprobe bridge nf_nat failed with message: insmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/llc/llc.ko \ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/802/stp.ko \ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/ipv6/ipv6.ko disable=1\ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/bridge/bridge.ko \ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/netfilter/nf_conntrack.ko \ninsmod /lib/modules/3.10.5-3.el6.x86_64/kernel/net/netfilter/nf_nat.ko \n, error: exit status 1" time="2016-06-25T18:54:56.380986865+08:00" level=fatal msg="Error starting daemon: Error initializing network controller: Error creating default \"bridge\" network: can't find an address range for interface \"docker0\""
这个问题的来源就是因为docker弱智地为docker0接口选择了一个172.17.42.1的IP,而恰好ECS占用了172.16.0.0/255.240.0.0。
解决方法有两种:
方法一:修改/etc/default/docker,添加DOCKER_OPTS=”–bip=192.168.17.1/24”,重启即可。注意不要用192.168.0.1/24,这段地址也被占用了。
方法二:启动docker服务在指定的网段。sudo docker –bip 192.168.100.1/24 -d &
上述两种方法均能过正常启动,本地均已测试通过,不过我还是觉得方法一好,直接把网段写入配置中,省的每次启动都要带上网段。
针对方法一进行如下说明,在/etc/default/docker文件中新增记录DOCKER_OPTS=”–bip=192.168.17.1/24”
[xiaolong.xiao@v069208183.sqa.zmf /var/log] $sudo vi /etc/default/docker Error detected while processing /root/.vimrc: line 16: E518: Unknown option: foldlevel=100 Press ENTER or type command to continue
有关docker0网桥的详细介绍参考:http://wiki.jikexueyuan.com/project/docker-technology-and-combat/docker0.html
利用命令docker version
[dddd@v069208183.sqa.zmf /var/log] $sudo docker version Client version: 1.7.1 Client API version: 1.19 Go version (client): go1.4.2 Git commit (client): 786b29d/1.7.1 OS/Arch (client): linux/amd64 Server version: 1.7.1 Server API version: 1.19 Go version (server): go1.4.2 Git commit (server): 786b29d/1.7.1 OS/Arch (server): linux/amd64
sudo chkconfig docker on
1、直接输入docker命令来查看所有的Options和Commands。
查看某一个command的详细使用方法:docker COMMAND –help
[dddd@v069208183.sqa.zmf /home/dddd] $sudo docker pull -help Warning: '-help' is deprecated, it will be replaced by '--help' soon. See usage. Usage: docker pull [OPTIONS] NAME[:TAG|@DIGEST] Pull an image or a repository from the registry -a, --all-tags=false Download all tagged images in the repository --help=false Print usage
2、搜索可用的docker镜像:docker search NAME
[dddd@v069208183.sqa.zmf /] $sudo docker search centos INFO[0104] GET /v1.19/images/search?term=centos NAME DESCRIPTION STARS OFFICIAL AUTOMATED centos The official build of CentOS. 2373 [OK] ansible/centos7-ansible Ansible on Centos7 77 [OK] jdeathe/centos-ssh CentOS-6 6.7 x86_64 / CentOS-7 7.2.1511 x8... 25 [OK] nimmis/java-centos This is docker images of CentOS 7 with dif... 12 [OK] million12/centos-supervisor Base CentOS-7 with supervisord launcher, h... 11 [OK] gluster/gluster-centos Official GlusterFS Image [ CentOS7 + Glus... 9 [OK] torusware/speedus-centos Always updated official CentOS docker imag... 8 [OK] nickistre/centos-lamp LAMP on centos setup 4 [OK] centos/mariadb55-centos7 3 [OK] nathonfowlie/centos-jre Latest CentOS image with the JRE pre-insta... 3 [OK] consol/sakuli-centos-xfce Sakuli end-2-end testing and monitoring co... 2 [OK] darksheer/centos Base Centos Image -- Updated hourly 1 [OK] blacklabelops/centos CentOS Base Image! Built and Updates Daily! 1 [OK] timhughes/centos Centos with systemd installed and running 1 [OK] grossws/centos CentOS 6 and 7 base images with gosu and l... 0 [OK] kz8s/centos Official CentOS plus epel-release 0 [OK] harisekhon/centos-scala Scala + CentOS (OpenJDK tags 2.10-jre7 - 2... 0 [OK] jsmigel/centos-epel Docker base image of CentOS w/ EPEL installed 0 [OK] labengine/centos Centos image base 0 [OK] ustclug/centos USTC centos 0 [OK] januswel/centos yum update-ed CentOS image 0 [OK] ericuni/centos centos dev 0 [OK] grayzone/centos auto build for centos. 0 [OK] dmglab/centos CentOS with some extras - This is for the ... 0 [OK] repositoryjp/centos Docker Image for CentOS. 0 [OK]
3、下载镜像:docker pull NAME[:TAG]
比如获取最新的centos镜像:docker pull centos:latest
注意:这里要写用docker search搜索到的完整的镜像名。
同时当前下载的是官方的镜像,下载速度会有点慢,centos镜像大约200M,下载耗时半小时。后面有时间将会实践如何搭建私有仓库。
[dddd@v069208183.sqa.zmf /home/dddd] $sudo docker pull centos:latest Pulling repository centos 2a332da70fd1: Download complete 3690474eb5b4: Download complete b48a20c39b28: Download complete c79ebe41b35a: Download complete Status: Downloaded newer image for centos:latest
4、查看安装的镜像:docker images [NAME]
$sudo docker images centos REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE centos latest 2a332da70fd1 3 weeks ago 196.8 MB
5、在docker容器中运行命令:docker run IMAGE [COMMAND] [ARG…]
docker run命令有两个参数,一个是镜像名,一个是要在镜像中运行的命令。
注意:IMAGE=REPOSITORY[:TAG],如果IMAGE参数不指定镜像的TAG,默认TAG为latest。
在刚刚下载的镜像中输出”loongshawn”:docker run centos echo ‘loongshawn’
[dddd@v069208183.sqa.zmf /home/dddd] $sudo docker run centos echo "loongshawn" loongshawn
6、列出容器:docker ps -a
查看最近生成的容器:docker ps -l
查看正在运行的容器:docker ps
7、显示容器的标准输出:docker logs CONTAINERID
无需拷贝完整的id,一般写最开始的三至四个字符即可。
8、在容器中安装新程序,比如安装ifconfig命令(centos7默认没有ifconfig)
运行镜像,执行ifconfig,找不到此命令。此时进入镜像执行yum install net-tools。
[dddd@v069208183.sqa.zmf /home/dddd] $sudo docker run -i -t centos /bin/bash [root@bed98ed5934a /]# ifconfig bash: ifconfig: command not found [root@bed98ed5934a /]#
给容器安装网络服务:
执行ifconfig命令:
9、保存对容器的修改并生成新的镜像:docker commit CONTAINERID [REPOSITORY[:TAG]]
REPOSITORY参数可以是新的镜像名字,也可以是旧的镜像名;如果和旧的镜像名和TAG都相同,会覆盖掉旧的镜像。
10、停止正在运行的容器:docker stop CONTAINERID
默认等待10秒钟再杀死指定容器。可以使用-t参数来设置等待时间。
11、查看容器或镜像的详细信息:docker inspect CONTAINERID|IMAGE
参数可以是容器的ID或者是镜像名(NAME:TAG)。
12、删除容器:docker rm CONTAINERID
查看所有容器ID:docker ps -a -q
删除所有的容器:docker rm $(docker ps -a -q)
13、删除镜像:docker rmi IMAGE
14.查看docker的信息,包括Containers和Images数目、kernel版本等。
1、创建一个新容器并登入:docker run -i -t IMAGE /bin/bash
使用image创建container并进入交互模式,login shell是/bin/bash,现在可以自由的对容器进行操作了。最后使用exit退出容器。
注意:如果IMAGE参数不指定TAG,默认TAG为latest。
$ sudo docker run -i -t centos /bin/bash
2、启动一个退出的容器:docker start CONTAINERID
[dddd@v069208183.sqa.zmf /home/dddd] $sudo docker start 340943d115b6 340943d115b6 [dddd@v069208183.sqa.zmf /home/dddd] $sudo docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 340943d115b6 centos "sleep 100" 11 minutes ago Up 6 seconds cocky_pare
3、attach到运行中的容器:docker attach CONTAINERID
以上就是“ECS如何部署Docker服务”这篇文章的所有内容,感谢各位的阅读!相信大家阅读完这篇文章都有很大的收获,小编每天都会为大家更新不同的知识,如果还想学习更多的知识,请关注亿速云行业资讯频道。
免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。