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 nginx41a0572cdd0e3b70e09ac9f74dcfc341c21ceef2c07dee714f0a24d94b1aa77f[root@foundation15~]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES41a0572cdd0e nginx"nginx -g 'daemon ..."4seconds ago Up3seconds80/tcp vm1[root@foundation15~]# docker container exec -it vm1 bashroot@41a0572cdd0e:/# ############################################################################################################################################创建容器时直接打开交互界面shell[root@foundation15~]# docker run -it --name vm2 nginx bashroot@d5f787395834:/# lsbin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usrvar##########################################################
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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####################################################################编写新的DockerfileFROM rhel7EXPOSE2280COPY yum.repo /etc/yum.repos.d/yum.repoRUN rpmdb --rebuilddb&& yum install -y openssh-server supervisor openssh-clients httpd&& yum clean allroot:westos | chpasswdRUN echoroot:westos | chpasswdRUN 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.confCMD ["/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.
[email protected]'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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**
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 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 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 between0and100.--shm-size=""Size of /dev/shm. The format is . number must be greater than0.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 is a positive integer. Unit can be one of b, k, m, or g. --kernel-memory=""
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