How to check how much memory docker takes up:
1. Use the docker stats command to check:
$ docker stats CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS b95a83497c91 awesome_brattain 0.28% 5.629MiB / 1.952GiB 0.28% 916B / 0B 147kB / 0B 9 67b2525d8ad1 foobar 0.00% 1.727MiB / 1.952GiB 0.09% 2.48kB / 0B 4.11MB / 0B 2 e5c383697914 test-1951.1.kay7x1lh1twk9c0oig50sd5tr 0.00% 196KiB / 1.952GiB 0.01% 71.2kB / 0B 770kB / 0B 1 4bda148efbc0 random.1.vnc8on831idyr42slu578u3cr 0.00% 1.672MiB / 1.952GiB 0.08% 110kB / 0B 578kB / 0B 2
2. First find the container ID of the container through docker ps -a, and then use ps -ef to find the process corresponding to the container. After obtaining the pid corresponding to the container, you can use top, pmap, ps and other commands to view the process memory to view the memory of the container. Occupancy situation.
top
top -p 5140
Content explanation
PID: ID of the process
USER: Process owner
PR: Priority level of the process , the smaller it is, the priority it will be executed
NInice: Value
VIRT: The virtual memory occupied by the process
RES: The physical memory occupied by the process
SHR: Shared memory used by the process
S: The status of the process. S means sleeping, R means running, Z means zombie state, N means the priority value of the process is a negative number
%CPU: The usage rate of the CPU occupied by the process
%MEM: The physics used by the process Percentage of memory and total memory
TIME: The total CPU time occupied by the process after it is started, that is, the accumulated value of the CPU usage time.
COMMAND: Process startup command name
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docker中rm和rmi的区别:rm命令用于删除一个或者多个容器,而rmi命令用于删除一个或者多个镜像;rm命令的语法为“docker rm [OPTIONS] CONTAINER [CONTAINER...]”,rmi命令的语法为“docker rmi [OPTIONS] IMAGE [IMAGE...]”。

docker官方镜像有:1、nginx,一个高性能的HTTP和反向代理服务;2、alpine,一个面向安全应用的轻量级Linux发行版;3、busybox,一个集成了三百多个常用Linux命令和工具的软件;4、ubuntu;5、PHP等等。

docker容器重启后数据会丢失的;但是可以利用volume或者“data container”来实现数据持久化,在容器关闭之后可以利用“-v”或者“–volumes-from”重新使用以前的数据,docker也可挂载宿主机磁盘目录,用来永久存储数据。

docker对于小型企业、个人、教育和非商业开源项目来说是免费的;2021年8月31日,docker宣布“Docker Desktop”将转变“Docker Personal”,将只免费提供给小型企业、个人、教育和非商业开源项目使用,对于其他用例则需要付费订阅。

docker能安装oracle。安装方法:1、拉取Oracle官方镜像,可以利用“docker images”查看镜像;2、启动容器后利用“docker exec -it oracle11g bash”进入容器,并且编辑环境变量;3、利用“sqlplus /nolog”进入oracle命令行即可。

解决方法:1、停止docker服务后,利用“rsync -avz /var/lib/docker 大磁盘目录/docker/lib/”将docker迁移到大容量磁盘中;2、编辑“/etc/docker/daemon.json”添加指定参数,将docker的目录迁移绑定;3、重载和重启docker服务即可。

容器管理ui工具有:1、Portainer,是一个轻量级的基于Web的Docker管理GUI;2、Kitematic,是一个GUI工具,可以更快速、更简单的运行容器;3、LazyDocker,基于终端的一个可视化查询工具;4、DockStation,一款桌面应用程序;5、Docker Desktop,能为Docker设置资源限制,比如内存,CPU,磁盘镜像大小;6、Docui。

AUFS是docker最早支持的存储引擎。AUFS是一种Union File System,是文件级的存储驱动,是Docker早期用的存储驱动,是Docker18.06版本之前,Ubuntu14.04版本前推荐的,支持xfs、ext4文件。


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