docker版mysql的使用和配置（2）——docker版mysql的dockerfile
阿新 • • 發佈：2018-08-25
啟動方式 oracl 端口號 sum war rms total htm clas
既然目標是定制滿足自己需要的dockerfile，那麽就來看看mysql的dockerfile長什麽樣。
dockerfile選擇的是 https://github.com/mysql/mysql-docker/blob/mysql-server/5.7/Dockerfile
原因是這個比較短（捂臉）
關於dockerfile中的各種命令，可以查看官方文檔，或者參考這篇： https://www.cnblogs.com/jie-fang/p/7927643.html
1 # Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 2# 3 # This program is free software; you can redistribute it and/or modify 4 # it under the terms of the GNU General Public License as published by 5 # the Free Software Foundation; version 2 of the License. 6 # 7 # This program is distributed in the hope that it will be useful, 8 # but WITHOUT ANY WARRANTY; without even the implied warranty of9 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 # GNU General Public License for more details. 11 # 12 # You should have received a copy of the GNU General Public License 13 # along with this program; if not, write to the Free Software 14 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 15 FROM oraclelinux:7-slim 16 17 ARG MYSQL_SERVER_PACKAGE_URL=https://repo.mysql.com/yum/mysql-5.7-community/docker/x86_64/mysql-community-server-minimal-5.7.23-1.el7.x86_64.rpm 18 ARG MYSQL_SHELL_PACKAGE_URL=https://repo.mysql.com/yum/mysql-tools-community/el/7/x86_64/mysql-shell-8.0.12-1.el7.x86_64.rpm 19 20 # Install server 21 RUN rpmkeys --import https://repo.mysql.com/RPM-GPG-KEY-mysql \ 22 && yum install -y $MYSQL_SERVER_PACKAGE_URL $MYSQL_SHELL_PACKAGE_URL libpwquality 23 && yum clean all 24 && mkdir /docker-entrypoint-initdb.d 25 26 VOLUME /var/lib/mysql 27 28 COPY docker-entrypoint.sh /entrypoint.sh 29 COPY healthcheck.sh /healthcheck.sh 30 ENTRYPOINT ["/entrypoint.sh"] 31 HEALTHCHECK CMD /healthcheck.sh 32 EXPOSE 3306 33060 33 CMD ["mysqld"]
咱們一行一行看。
FROM oraclelinux:7-slim
15行，這裏是oracle自己的linux，不過看後面使用的是yum，我們自己配置的時候大概可以用centos代替。
ARG MYSQL_SERVER_PACKAGE_URL=https://repo.mysql.com/yum/mysql-5.7-community/docker/x86_64/mysql-community-server-minimal-5.7.23-1.el7.x86_64.rpm ARG MYSQL_SHELL_PACKAGE_URL=https://repo.mysql.com/yum/mysql-tools-community/el/7/x86_64/mysql-shell-8.0.12-1.el7.x86_64.rpm
17和18兩行，定義了兩個變量用來指向接下來需要用的rpm包的地址。
RUN rpmkeys --import https://repo.mysql.com/RPM-GPG-KEY-mysql \ && yum install -y $MYSQL_SERVER_PACKAGE_URL $MYSQL_SHELL_PACKAGE_URL libpwquality && yum clean all && mkdir /docker-entrypoint-initdb.d
21～24行，這裏安裝了mysql包。如果我們進行簡化的話，rpmkeys和libpwquality都可以省略掉。
VOLUME /var/lib/mysql COPY docker-entrypoint.sh /entrypoint.sh COPY healthcheck.sh /healthcheck.sh ENTRYPOINT ["/entrypoint.sh"] HEALTHCHECK CMD /healthcheck.sh
26～31行，這裏復制了需要的腳本文件，重點是entrypoint.sh。healthcheck如果進行簡化的話也可以省略掉。
EXPOSE 3306 33060
32行規定了向主機暴露的端口號。如果不需要的話可以省略。另外註意，並不是expose了就可以用，還是需要在run的時候進行端口映射。
CMD ["mysqld"]
最後33行是dockerfile執行的啟動命令（的參數）。
根據上面的分析，我們自己的dockerfile的mysql部分，大概應該是這樣的：
FROM centos:7.2.1511 ARG MYSQL_SERVER_PACKAGE_URL=https://repo.mysql.com/yum/mysql-5.7-community/docker/x86_64/mysql-community-server-minimal-5.7.23-1.el7.x86_64.rpm ARG MYSQL_SHELL_PACKAGE_URL=https://repo.mysql.com/yum/mysql-tools-community/el/7/x86_64/mysql-shell-8.0.12-1.el7.x86_64.rpm RUN yum install -y --nogpgcheck $MYSQL_SERVER_PACKAGE_URL $MYSQL_SHELL_PACKAGE_URL COPY docker-entrypoint.sh /entrypoint.sh ENTRYPOINT ["/entrypoint.sh"] CMD ["mysqld"]
然後就可以先試試看了：
shell> docker build -t mysql_basic . Sending build context to Docker daemon 10.24kB Step 1/7 : FROM centos:7.2.1511 ---> ddc0fb7d7a72 Step 2/7 : ARG MYSQL_SERVER_PACKAGE_URL=https://repo.mysql.com/yum/mysql-5.7-community/docker/x86_64/mysql-community-server-minimal-5.7.23-1.el7.x86_64.rpm ---> Running in 3ff12f470551 Removing intermediate container 3ff12f470551 ---> a544211d9806 Step 3/7 : ARG MYSQL_SHELL_PACKAGE_URL=https://repo.mysql.com/yum/mysql-tools-community/el/7/x86_64/mysql-shell-8.0.12-1.el7.x86_64.rpm ---> Running in fa793935528a Removing intermediate container fa793935528a ---> ecc70ab46823 Step 4/7 : RUN yum install -y --nogpgcheck $MYSQL_SERVER_PACKAGE_URL $MYSQL_SHELL_PACKAGE_URL ---> Running in 6f3dd9f850f2 Loaded plugins: fastestmirror Examining /var/tmp/yum-root-2ratBJ/mysql-community-server-minimal-5.7.23-1.el7.x86_64.rpm: mysql-community-server-minimal-5.7.23-1.el7.x86_64 Marking /var/tmp/yum-root-2ratBJ/mysql-community-server-minimal-5.7.23-1.el7.x86_64.rpm to be installed Examining /var/tmp/yum-root-2ratBJ/mysql-shell-8.0.12-1.el7.x86_64.rpm: mysql-shell-8.0.12-1.el7.x86_64 Marking /var/tmp/yum-root-2ratBJ/mysql-shell-8.0.12-1.el7.x86_64.rpm to be installed Resolving Dependencies --> Running transaction check ---> Package mysql-community-server-minimal.x86_64 0:5.7.23-1.el7 will be installed --> Processing Dependency: libaio.so.1(LIBAIO_0.1)(64bit) for package: mysql-community-server-minimal-5.7.23-1.el7.x86_64 Determining fastest mirrors * base: mirror.hmc.edu * extras: mirror.nodesdirect.com * updates: mirror.teklinks.com --> Processing Dependency: libaio.so.1(LIBAIO_0.4)(64bit) for package: mysql-community-server-minimal-5.7.23-1.el7.x86_64 --> Processing Dependency: libnuma.so.1(libnuma_1.1)(64bit) for package: mysql-community-server-minimal-5.7.23-1.el7.x86_64 --> Processing Dependency: libnuma.so.1(libnuma_1.2)(64bit) for package: mysql-community-server-minimal-5.7.23-1.el7.x86_64 --> Processing Dependency: libaio.so.1()(64bit) for package: mysql-community-server-minimal-5.7.23-1.el7.x86_64 --> Processing Dependency: libnuma.so.1()(64bit) for package: mysql-community-server-minimal-5.7.23-1.el7.x86_64 ---> Package mysql-shell.x86_64 0:8.0.12-1.el7 will be installed --> Running transaction check ---> Package libaio.x86_64 0:0.3.109-13.el7 will be installed ---> Package numactl-libs.x86_64 0:2.0.9-7.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: mysql-community-server-minimal x86_64 5.7.23-1.el7 /mysql-community-server-minimal-5.7.23-1.el7.x86_64 67 M mysql-shell x86_64 8.0.12-1.el7 /mysql-shell-8.0.12-1.el7.x86_64 25 M Installing for dependencies: libaio x86_64 0.3.109-13.el7 base 24 k numactl-libs x86_64 2.0.9-7.el7 base 29 k Transaction Summary ================================================================================ Install 2 Packages (+2 Dependent packages) Total size: 92 M Total download size: 54 k Installed size: 92 M Downloading packages: -------------------------------------------------------------------------------- Total 33 kB/s | 54 kB 00:01 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : numactl-libs-2.0.9-7.el7.x86_64 1/4 Installing : libaio-0.3.109-13.el7.x86_64 2/4 Installing : mysql-community-server-minimal-5.7.23-1.el7.x86_64 3/4 Installing : mysql-shell-8.0.12-1.el7.x86_64 4/4 Verifying : mysql-community-server-minimal-5.7.23-1.el7.x86_64 1/4 Verifying : libaio-0.3.109-13.el7.x86_64 2/4 Verifying : numactl-libs-2.0.9-7.el7.x86_64 3/4 Verifying : mysql-shell-8.0.12-1.el7.x86_64 4/4 Installed: mysql-community-server-minimal.x86_64 0:5.7.23-1.el7 mysql-shell.x86_64 0:8.0.12-1.el7 Dependency Installed: libaio.x86_64 0:0.3.109-13.el7 numactl-libs.x86_64 0:2.0.9-7.el7 Complete! Removing intermediate container 6f3dd9f850f2 ---> e118192698af Step 5/7 : COPY docker-entrypoint.sh /entrypoint.sh ---> 1aab375ae211 Step 6/7 : ENTRYPOINT ["/entrypoint.sh"] ---> Running in 4c99517c3da0 Removing intermediate container 4c99517c3da0 ---> 54f44871daeb Step 7/7 : CMD ["mysqld"] ---> Running in f534cb3d8f0e Removing intermediate container f534cb3d8f0e ---> dc0ae9f1dc87 Successfully built dc0ae9f1dc87 Successfully tagged mysql_basic:latest
看看image
shell> docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mysql_basic latest dc0ae9f1dc87 About a minute ago 400MB
跑起來看看
shell> docker run -d --name mysqlbasic mysql_basic shell> docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a7efdfdaa91d mysql_basic "/entrypoint.sh mysq…" 5 seconds ago Up 3 seconds mysqlbasic
再看看docker裏面的情況
docker exec -it mysqlbasic bash [root@a7efdfdaa91d /]# mysql ERROR 1045 (28000): Access denied for user ‘root‘@‘localhost‘ (using password: NO)
哈哈access denied。上一篇說過的，第一次密碼是隨機生成的。那麽我們來拿密碼試試。
shell> docker logs mysqlbasic [Entrypoint] MySQL Docker Image 5.7.23-1.1.7 [Entrypoint] No password option specified for new database. [Entrypoint] A random onetime password will be generated. [Entrypoint] Initializing database [Entrypoint] Database initialized Warning: Unable to load ‘/usr/share/zoneinfo/iso3166.tab‘ as time zone. Skipping it. Warning: Unable to load ‘/usr/share/zoneinfo/zone.tab‘ as time zone. Skipping it. [Entrypoint] GENERATED ROOT PASSWORD: 0D0horOvZOHufUpuvAr0L]UkOBX3 [Entrypoint] ignoring /docker-entrypoint-initdb.d/* [Entrypoint] Server shut down [Entrypoint] Setting root user as expired. Password will need to be changed before database can be used. [Entrypoint] MySQL init process done. Ready for start up. [Entrypoint] Starting MySQL 5.7.23-1.1.7 [root@a7efdfdaa91d /]# mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 6 Server version: 5.7.23 Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. mysql>
成功的登錄了root賬號。這樣，我們就把dockerfile裏關鍵的部分提取出來，並且可以正常的build和run了。
接下來的問題，我們不能每次都先找隨機生成的密碼，然後再登錄。所以我們要把mysql的初始化和啟動服務的過程搞清楚。這樣才能根據自己的要求進行修改。
接下來是下一篇的內容了！
PS：其實這種方法是有其本身的問題的……比如，很多時候，我們並不要把docker扔到後臺運行，而是直接在前臺運行一個bash。
那麽我們來試試剛才build的image。
shell> docker run -it --name mysqlbasic mysql_basic /bin/bash [Entrypoint] MySQL Docker Image 5.7.23-1.1.7 [root@4e2ee3952247 /]# mysql ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2)
首先，我們和剛才用docker logs打出的log對比一下，發現這裏Entrypoint只有一行。看來前後臺的docker啟動方式有一些不同。
那麽這種不同導致了什麽區別呢？嘗試一下mysql。哎呀居然報了錯誤。
看來需要仔細研究一下entrypoint.sh到底幹了什麽。（就是下一篇的內容了！）
docker版mysql的使用和配置（2）——docker版mysql的dockerfile