在Docker构build过程中，Docker无法启动MariaDB / MySQL
我目前的Dockerfile看起来像这样：
FROM ubuntu:14.04 ENV DEBIAN_FRONTEND noninteractive ENV INITRD No ENV LANG en_US.UTF-8 # Maria DB Versions ENV MARIADB_MAJOR 5.5 ENV MARIADB_VERSION 5.5.55+maria-1~trusty # Create mysql user and group RUN groupadd -r mysql && useradd -r -g mysql mysql # Install needed dependencies RUN apt-get update && apt-get install -y --no-install-recommends software-properties-common && rm -rf /var/lib/apt/lists/* # Add the MariaDB PGP key to verify their Debian packages. RUN apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db # Add MariaDB's repository. We use the Ubuntu 14.04 version as there ain't no MariaDB 5.5 for Ubuntu 16.04. RUN add-apt-repository 'deb http://mirror.jmu.edu/pub/mariadb/repo/5.5/ubuntu trusty main' # Install Maria DB and open the access for outside of the container RUN apt-get update \ && apt-get install -y --no-install-recommends mariadb-server=$MARIADB_VERSION \ && rm -rf /var/lib/apt/lists/* \ && sed -i 's/^\(bind-address\s.*\)/# \1/' /etc/mysql/my.cnf \ && update-rc.d -f mysql disable # Run as user mysql USER mysql # Start the MariaDB to add a user and create the DB RUN mysqld RUN echo "@TODO: Create DB, User and grant access" # Expose Port EXPOSE 3306
使用docker build -t testmariadb .容器时docker build -t testmariadb . 我得到以下输出：
Step 13/17 : RUN mysqld ---> Running in 5aeb49c81f5e 170428 20:00:25 [Note] mysqld (mysqld 5.5.55-MariaDB-1~trusty) starting as process 7 ... 170428 20:00:25 InnoDB: The InnoDB memory heap is disabled 170428 20:00:25 InnoDB: Mutexes and rw_locks use GCC atomic builtins 170428 20:00:25 InnoDB: Compressed tables use zlib 1.2.8 170428 20:00:25 InnoDB: Using Linux native AIO 170428 20:00:25 InnoDB: Initializing buffer pool, size = 256.0M 170428 20:00:25 InnoDB: Completed initialization of buffer pool InnoDB: The first specified data file ./ibdata1 did not exist: InnoDB: a new database to be created! 170428 20:00:25 InnoDB: Setting file ./ibdata1 size to 10 MB InnoDB: Database physically writes the file full: wait... 170428 20:00:25 InnoDB: Log file ./ib_logfile0 did not exist: new to be created InnoDB: Setting log file ./ib_logfile0 size to 5 MB InnoDB: Database physically writes the file full: wait... 170428 20:00:25 InnoDB: Log file ./ib_logfile1 did not exist: new to be created InnoDB: Setting log file ./ib_logfile1 size to 5 MB InnoDB: Database physically writes the file full: wait... InnoDB: Doublewrite buffer not found: creating new InnoDB: Doublewrite buffer created InnoDB: 127 rollback segment(s) active. InnoDB: Creating foreign key constraint system tables InnoDB: Foreign key constraint system tables created 170428 20:00:25 InnoDB: Waiting for the background threads to start 170428 20:00:26 Percona XtraDB (http://www.percona.com) 5.5.52-MariaDB-38.3 started; log sequence number 0 170428 20:00:26 [Note] Plugin 'FEEDBACK' is disabled. 170428 20:00:26 [Note] Server socket created on IP: '0.0.0.0'. 170428 20:00:26 [Note] Event Scheduler: Loaded 0 events 170428 20:00:26 [Note] mysqld: ready for connections. Version: '5.5.55-MariaDB-1~trusty' socket: '/var/run/mysqld/mysqld.sock' port: 3306 mariadb.org binary distribution
据我所知，它启动MariaDB，但然后卡在那里，不执行下一个命令。 有没有另外一种方式来启动docker中的MariaDB？
1）没有卡住。 MariaDB开始运行。 但是您需要使用CMD命令而不是RUN命令来实现您的目的。
命令CMD与RUN类似，可用于执行特定的命令。 然而，与RUN不同的是，在构build过程中不会执行，而是在使用正在构build的映像实例化容器时。
2）你的dockerfile的最后部分应该是这样的
#Run as user mysql USER mysql RUN echo "@TODO: Create DB, User and grant access" #Expose Port EXPOSE 3306 #Right way to run mysqld CMD ["mysqld"]
为了build立你的形象
docker build -t testmariadb .
用于运行构build的图像
docker run testmariadb
或者（对于分离模式）
docker run -d testmariadb
3）请问你自己为什么你使用Ubuntu的基础映像（从Ubuntu的：14.04）。 据我说，如果你只是想在容器中运行mariaDb，你应该使用https://hub.docker.com/_/mariadb/ 。
运行容器你使用的是什么docker命令？
请关注MariaDB官方的Docker文件。 Docker MariaDB
这里是最新的DockerFile MariaDB
这是错误的
# Start the MariaDB to add a user and create the DB RUN mysqld
我想你想要
CMD mysqld
或者这样
从中看到
https://github.com/docker-library/mysql/blob/7a850980c4b0d5fb5553986d280ebfb43230a6bb/8.0/Dockerfile
结束了
EXPOSE 3306 CMD ["mysqld"]
RUN，WORKDIR，ADD，COPY，ENV（和其他一些）可以帮助你configuration你的docker镜像，ENTRYPOINT和CMD来启动你的软件（nginx的图像，Wordpress的…）
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