学习是一种快乐，而不是一种乐趣

 

如何进入服务容器内部

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使用exec命令进入
[root@foundation15 ~]# docker  run  -d --name vm1 nginx
41a0572cdd0e3b70e09ac9f74dcfc341c21ceef2c07dee714f0a24d94b1aa77f
[root@foundation15 ~]# docker ps 
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
41a0572cdd0e        nginx               "nginx -g 'daemon ..."   4 seconds ago       Up 3 seconds        80/tcp              vm1


[root@foundation15 ~]# docker container exec -it  vm1 bash
root@41a0572cdd0e:/# 
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创建容器时直接打开交互界面shell
[root@foundation15 ~]# docker  run -it --name vm2 nginx  bash
root@d5f787395834:/# ls
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
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使用supervisord同时打开多个服务

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封装一个新的镜像
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编写新的Dockerfile

FROM rhel7
EXPOSE 22 80
COPY yum.repo  /etc/yum.repos.d/yum.repo
RUN  rpmdb  --rebuilddb&&  yum install -y openssh-server supervisor   openssh-clients httpd&& yum clean all    root:westos | chpasswd
RUN echo  root:westos | chpasswd
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -q -N ""
RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -q -N ""
COPY supervisord.conf /etc/supervisord.conf
CMD ["/usr/bin/supervisord"]

ssh部分生产环境可以写在一起  但实验化环境为了清除了理解过程分开写

supervisord配置文件
[supervisord]
nodaemon=true
[program:sshd]
command=/usr/sbin/sshd -D
[program:httpd]
command=/usr/sbin/httpd

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build创建新镜像即可
[root@foundation15 docker]# docker build -t  rhel7:v3  .
Sending build context to Docker daemon 7.168 kB
Step 1/9 : FROM rhel7
 ---> 0a3eb3fde7fd
Step 2/9 : EXPOSE 22 80
 ---> Using cache
 ---> 1ec0317a22b7
Step 3/9 : COPY yum.repo /etc/yum.repos.d/yum.repo
 ---> Using cache
 ---> de3c79e1b8df
Step 4/9 : RUN rpmdb  --rebuilddb&&  yum install -y openssh-server supervisor   openssh-clients httpd&& yum clean all    root:westos | chpasswd
 ---> Using cache
 ---> 4b108c1cd6ab
Step 5/9 : RUN echo  root:westos | chpasswd
 ---> Running in d549e2f4dc2d
 ---> 916e64011fea
Removing intermediate container d549e2f4dc2d
Step 6/9 : RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -q -N ""
 ---> Running in 23d52c8a575c
 ---> cba68be457bc
Removing intermediate container 23d52c8a575c
Step 7/9 : RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -q -N ""
 ---> Running in 200c813e6e7e
 ---> 6317ae0edd48
Removing intermediate container 200c813e6e7e
Step 8/9 : COPY supervisord.conf /etc/supervisord.conf
 ---> 2dd5c9ef0be1
Removing intermediate container 2666c11d86dd
Step 9/9 : CMD /usr/bin/supervisord
 ---> Running in 2a15083c3b60
 ---> 15846d8145b3
Removing intermediate container 2a15083c3b60
Successfully built 15846d8145b3



[root@foundation15 docker]# docker  images
REPOSITORY          TAG                 IMAGE ID            CREATED              SIZE
rhel7               v3                  15846d8145b3        13 seconds ago       202 MB

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使用新镜像创建容器

[root@foundation15 docker]# docker run -d  --name  vm1  -v /tmp/docker/web/:/var/www/html  rhel7:v3 
5d6054ef42d8c01dfb9191b90ade1302fa85db3b12e6b775225623ed36bda53b
[root@foundation15 docker]# docker  ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
5d6054ef42d8        rhel7:v3            "/usr/bin/supervisord"   2 seconds ago       Up 2 seconds        22/tcp, 80/tcp      vm1
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测试
[root@foundation15 docker]# ssh 172.17.0.2
The authenticity of host '172.17.0.2 (172.17.0.2)' can't be established.
RSA key fingerprint is 38:a9:59:49:4b:2f:bc:32:25:81:72:ce:aa:67:b4:74.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '172.17.0.2' (RSA) to the list of known hosts.
root@172.17.0.2's password: 
-bash-4.2# ip addr
-bash: ip: command not found
-bash-4.2# ^C        
-bash-4.2# ^C
-bash-4.2# ^C
-bash-4.2# logout
Connection to 172.17.0.2 closed.
[root@foundation15 docker]# docker  ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
5d6054ef42d8        rhel7:v3            "/usr/bin/supervisord"   50 seconds ago      Up 50 seconds       22/tcp, 80/tcp      vm1

[root@foundation15 docker]# curl  172.17.0.2
www.westos.org
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**有需要的联系我哦微信yxxy1717                        qq    2173384986

doker中关于内存的使用

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目前 Docker 支持内存资源限制选项

    -m, --memory=""
        Memory limit (format: <number>[<unit>]). Number is a positive integer. Unit can be one of b, k, m, or g. Minimum is 4M.
    --memory-swap=""
        Total memory limit (memory + swap, format: <number>[<unit>]). Number is a positive integer. Unit can be one of b, k, m, or g.
    --memory-swappiness=""
        Tune a container’s memory swappiness behavior. Accepts an integer between 0 and 100.
    --shm-size=""
        Size of /dev/shm. The format is <number><unit>. number must be greater than 0. Unit is optional and can be b (bytes), k (kilobytes), m (megabytes), or g(gigabytes). If you omit the unit, the system uses bytes. If you omit the size entirely, the system uses 64m.
        根据实际需求设置，这里不作过多的介绍
    --memory-reservation=""
        Memory soft limit (format: <number>[<unit>]). Number is a positive integer. Unit can be one of b, k, m, or g.
    --kernel-memory=""