由于测试环境不足，决定利用docker来虚拟化几个centos系统。以下是具体步骤：
[root@summer ~]# docker run --rm -d -i -t centos:centos7.5.1804 /bin/bash [root@summer ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 4ba3c5252384 centos:centos7.5.1804 "/bin/bash" 12 minutes ago Up 12 minutes inspiring_raman
[root@summer ~]# docker attach 4ba3c5252384 [root@4ba3c5252384 /]# ll total 0 lrwxrwxrwx 1 root root 7 May 31 2018 bin -> usr/bin drwxr-xr-x 5 root root 360 Nov 19 07:12 dev drwxr-xr-x 1 root root 66 Nov 19 07:12 etc drwxr-xr-x 2 root root 6 Apr 11 2018 home lrwxrwxrwx 1 root root 7 May 31 2018 lib -> usr/lib lrwxrwxrwx 1 root root 9 May 31 2018 lib64 -> usr/lib64 drwxr-xr-x 2 root root 6 Apr 11 2018 media drwxr-xr-x 2 root root 6 Apr 11 2018 mnt drwxr-xr-x 2 root root 6 Apr 11 2018 opt dr-xr-xr-x 547 root root 0 Nov 19 07:12 proc dr-xr-x--- 2 root root 114 May 31 2018 root drwxr-xr-x 10 root root 130 May 31 2018 run lrwxrwxrwx 1 root root 8 May 31 2018 sbin -> usr/sbin drwxr-xr-x 2 root root 6 Apr 11 2018 srv dr-xr-xr-x 13 root root 0 Nov 19 03:36 sys drwxrwxrwt 7 root root 132 May 31 2018 tmp drwxr-xr-x 13 root root 155 May 31 2018 usr drwxr-xr-x 18 root root 238 May 31 2018 var [root@4ba3c5252384 /]# yum install -y net-tools.x86_64 wget vim-enhanced passwd openssl openssh-server
[root@4ba3c5252384 /]# passwd root Changing password for user root. New password: BAD PASSWORD: The password is shorter than 8 characters Retype new password: passwd: all authentication tokens updated successfully.
[root@4ba3c5252384 /]# ssh-keygen -q -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N '' [root@4ba3c5252384 /]# ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N '' [root@4ba3c5252384 /]# ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key -N '' Generating public/private dsa key pair. Your identification has been saved in /etc/ssh/ssh_host_ed25519_key. Your public key has been saved in /etc/ssh/ssh_host_ed25519_key.pub. The key fingerprint is: SHA256:JNwMr0XzOeTDSQPWCRRMW//UjttKHl3BqDRnwadFdM8 root@4ba3c5252384 The key's randomart image is: +---[DSA 1024]----+ | .+X==...oo.| | . B.Xo= .+=o| | o B Oo.+=oE| | = .o=+ o.| | . S . o o| | +.| | + o| | o o | | o | +----[SHA256]-----+ [root@4ba3c5252384 /]# vim /etc/ssh/sshd_config # PermitRootLogin yes # PasswordAuthentication yes [root@4ba3c5252384 /]# /usr/sbin/sshd -D [root@4ba3c5252384 /]# ps -ef |grep sshd root 102 1 0 07:53 ? 00:00:00 /usr/sbin/sshd root 104 1 0 07:53 pts/0 00:00:00 grep --color=auto sshd
Ctrl+P+Q
生成镜像
[root@summer ~]# docker commit 4ba3c5252384 summer/centos7-ssh sha256:9736e16c354ba3a82a1bf5ec65b33d8dbfa6a132e65a5ae0a31c8fe0e5da513f [root@summer ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE summer/centos7-ssh latest 9736e16c354b 6 seconds ago 346MB
[root@summer ~]# docker run -itd -p 10222:22 9736e16c354b /bin/bash
744fe36d22d3762e9976b41fb3600442776d9a0f2cbaf5f97baf1329a33c7249
[root@summer ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
744fe36d22d3 9736e16c354b "/bin/bash" 6 seconds ago Up 4 seconds 0.0.0.0:10222->22/tcp quizzical_beaver
- 用xshell工具连接容器测试
Connecting to 192.168.0.8:10222...
Connection established.
To escape to local shell, press Ctrl+Alt+].
WARNING! The remote SSH server rejected X11 forwarding request.
[root@744fe36d22d3 ~]# ll
total 4
-rw------- 1 root root 3302 May 31 2018 anaconda-ks.cfg
[root@744fe36d22d3 ~]# cd /
[root@744fe36d22d3 /]# ll
total 0
lrwxrwxrwx 1 root root 7 May 31 2018 bin -> usr/bin
drwxr-xr-x 5 root root 360 Nov 19 08:01 dev
drwxr-xr-x 1 root root 66 Nov 19 08:01 etc
drwxr-xr-x 2 root root 6 Apr 11 2018 home
lrwxrwxrwx 1 root root 7 May 31 2018 lib -> usr/lib
lrwxrwxrwx 1 root root 9 May 31 2018 lib64 -> usr/lib64
drwxr-xr-x 2 root root 6 Apr 11 2018 media
drwxr-xr-x 2 root root 6 Apr 11 2018 mnt
drwxr-xr-x 2 root root 6 Apr 11 2018 opt
dr-xr-xr-x 551 root root 0 Nov 19 08:01 proc
dr-xr-x--- 1 root root 22 Nov 19 07:52 root
drwxr-xr-x 1 root root 34 Nov 19 07:52 run
lrwxrwxrwx 1 root root 8 May 31 2018 sbin -> usr/sbin
drwxr-xr-x 2 root root 6 Apr 11 2018 srv
dr-xr-xr-x 13 root root 0 Nov 19 03:36 sys
drwxrwxrwt 1 root root 6 Nov 19 07:49 tmp
drwxr-xr-x 1 root root 81 May 31 2018 usr
drwxr-xr-x 1 root root 17 May 31 2018 var
- 测试查看的ip为创建容器随机的ip
[root@744fe36d22d3 /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.4 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:ac:11:00:04 txqueuelen 0 (Ethernet)
RX packets 82 bytes 7997 (7.8 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 67 bytes 10147 (9.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
<p>lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@744fe36d22d3 /]#Docker安装后，默认会创建下面三种网络类型：
[root@summer ~]# docker network ls NETWORK ID NAME DRIVER SCOPE f05274e4383e bridge bridge local 1fc2e68d0f32 easymock_easy-mock bridge local a1a2e4e0720c host host local b80f2704c864 none null local [root@summer ~]#
默认情况下启动Docker容器，都是使用bridge,Docker安装时创建Docker容器重启时，会按照顺序获取对应的IP地址，这个就导致重启下，Docker的IP地址就变了。
使用–network=none,docker容器就不分配局域网的IP
使用–network=host,此时,Docker容器的网络会附属在主机上，两者是互通的。
创建自定义网络，并指定网段：192.168.200.0/24 （注意这里使用的200段，不能和宿主机器所在的网段相同）
[root@summer ~]# docker network create --subnet=192.168.200.0/24 dockernet 39c96ae62ecdea7a8ea057e3e4c12c71c166f726925b4bc3c71e790359fa1c52 [root@summer ~]# docker network ls NETWORK ID NAME DRIVER SCOPE f05274e4383e bridge bridge local 39c96ae62ecd dockernet bridge local 1fc2e68d0f32 easymock_easy-mock bridge local a1a2e4e0720c host host local b80f2704c864 none null local [root@summer ~]#
使用指定ip启动容器
[root@summer ~]# docker run --privileged -itd --name dockerOS123 --net dockernet --ip 192.168.200.123 -p 10123:22 summer/centos7-ssh:latest /usr/sbin/sshd -D 0bf84b002ffd50b43bc101a20cd7ba630fbdd08980e5b2061dd241593b08a046 [root@summer ~]# docker run --privileged -itd --name dockerOS124 --net dockernet --ip 192.168.200.124 -p 10124:22 summer/centos7-ssh:latest /usr/sbin/sshd -D e7171019510dfa8f8f38e1d4ae934a12eebbaac15848068429a10a1c75a27fb4 [root@summer ~]# docker run --privileged -itd --name dockerOS125 --net dockernet --ip 192.168.200.125 -p 10125:22 summer/centos7-ssh:latest /usr/sbin/sshd -D 19ff8426d4cca170d919694c39cb943993987304e459738acdc2694006907877 [root@summer ~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 19ff8426d4cc summer/centos7-ssh:latest "/usr/sbin/sshd -D" 9 seconds ago Up 7 seconds 0.0.0.0:10125->22/tcp dockerOS125 e7171019510d summer/centos7-ssh:latest "/usr/sbin/sshd -D" 19 seconds ago Up 17 seconds 0.0.0.0:10124->22/tcp dockerOS124 0bf84b002ffd summer/centos7-ssh:latest "/usr/sbin/sshd -D" 30 seconds ago Up 29 seconds 0.0.0.0:10123->22/tcp dockerOS123
以上就是docker虚拟化多个Centos7的详细内容，更多请关注php中文网其它相关文章！
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