摘要：上一篇容器化開發(fā)環(huán)境數(shù)據(jù)庫連接和遷移分享了關(guān)于如何給容器中的應(yīng)用創(chuàng)建數(shù)據(jù)庫連接，接下來將分享一下如何將數(shù)據(jù)庫從應(yīng)用容器中分離出來。
上一篇容器化開發(fā)環(huán)境 - 數(shù)據(jù)庫連接和遷移分享了關(guān)于如何給容器中的應(yīng)用創(chuàng)建數(shù)據(jù)庫連接，接下來將分享一下如何將數(shù)據(jù)庫從應(yīng)用容器中分離出來。
為什么要進(jìn)行分離？當(dāng)應(yīng)用和數(shù)據(jù)庫在同一個容器中運(yùn)行時，也就意味著，應(yīng)用和數(shù)據(jù)庫的生命周期捆綁在了一起，應(yīng)用和數(shù)據(jù)庫的運(yùn)行就會出現(xiàn)相互干擾現(xiàn)象，應(yīng)用的異常將有可能導(dǎo)致容器的停止，同時也將導(dǎo)致數(shù)據(jù)庫的關(guān)閉。更主要的原因是，很多時候需要多個容器中的應(yīng)用連接一個數(shù)據(jù)庫，為了保證容器之間的運(yùn)行相互獨(dú)立，相互不影響，就有必要將數(shù)據(jù)庫隔離在獨(dú)立的容器中運(yùn)行，讓數(shù)據(jù)庫和容器獨(dú)處二人世界，同時保證數(shù)據(jù)庫的生命周期不在受其它應(yīng)用影響。
Setup Codebase
clone hello-dockerie repo
$ git clone https://github.com/aikin/hello-dockerize.git
Separate MySQL Dockerfile
在dockerize目錄下創(chuàng)建mysql/Dockerfle
修改mysql/Dockerfile，配置安裝MySQL腳本：
FROM ubuntu:14.04
RUN apt-get update
# === Install Mysql ===
RUN groupadd -r mysql && useradd -r -g mysql mysql
RUN mkdir /docker-entrypoint-initdb.d
ENV MYSQL_MAJOR 5.7
ENV MYSQL_VERSION 5.7.11-1ubuntu14.04
# gpg: key 5072E1F5: public key "MySQL Release Engineering " imported
RUN apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys A4A9406876FCBD3C456770C88C718D3B5072E1F5
RUN echo "deb http://repo.mysql.com/apt/ubuntu/ trusty mysql-${MYSQL_MAJOR}" > /etc/apt/sources.list.d/mysql.list
# the "/var/lib/mysql" stuff here is because the mysql-server postinst doesn"t have an explicit way to disable the mysql_install_db codepath besides having a database already "configured" (ie, stuff in /var/lib/mysql/mysql)
# also, we set debconf keys to make APT a little quieter
RUN {
echo mysql-community-server mysql-community-server/data-dir select "";
echo mysql-community-server mysql-community-server/root-pass password "";
echo mysql-community-server mysql-community-server/re-root-pass password "";
echo mysql-community-server mysql-community-server/remove-test-db select false;
} | debconf-set-selections
RUN apt-get update && apt-get install -y mysql-server="${MYSQL_VERSION}"
RUN rm -rf /var/lib/apt/lists/*
RUN rm -rf /var/lib/mysql && mkdir -p /var/lib/mysql
# comment out a few problematic configuration values
# don"t reverse lookup hostnames, they are usually another container
RUN sed -Ei "s/^(bind-address|log)/#&/" /etc/mysql/my.cnf
&& echo "skip-host-cache
skip-name-resolve" | awk "{ print } $1 == "[mysqld]" && c == 0 { c = 1; system("cat") }" /etc/mysql/my.cnf > /tmp/my.cnf
&& mv /tmp/my.cnf /etc/mysql/my.cnf
VOLUME /var/lib/mysql
COPY docker-entrypoint.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/docker-entrypoint.sh
RUN ln -s usr/local/bin/docker-entrypoint.sh /entrypoint.sh # backwards compat
ENTRYPOINT ["docker-entrypoint.sh"]
EXPOSE 3306
CMD ["mysqld"]
修改dockerize/Dockerfile，移除安裝MySQL的配置：
FROM ubuntu:14.04
RUN apt-get update
ENV VERSION 8
ENV UPDATE 66
ENV BUILD 17
ENV JAVA_HOME /usr/lib/jvm/java-${VERSION}-oracle
ENV JRE_HOME ${JAVA_HOME}/jre
RUN apt-get install ca-certificates curl
gcc libc6-dev libssl-dev make
-y --no-install-recommends
RUN curl --silent --location --retry 3 --cacert /etc/ssl/certs/GeoTrust_Global_CA.pem
--header "Cookie: oraclelicense=accept-securebackup-cookie;"
http://download.oracle.com/otn-pub/java/jdk/"${VERSION}"u"${UPDATE}"-b"${BUILD}"/server-jre-"${VERSION}"u"${UPDATE}"-linux-x64.tar.gz
| tar xz -C /tmp
RUN mkdir -p /usr/lib/jvm && mv /tmp/jdk1.${VERSION}.0_${UPDATE} "${JAVA_HOME}"
RUN apt-get install -y openssl
RUN apt-get remove --purge --auto-remove -y
gcc
libc6-dev
libssl-dev
make
RUN apt-get autoclean && apt-get --purge -y autoremove
RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
RUN update-alternatives --install "/usr/bin/java" "java" "${JRE_HOME}/bin/java" 1 &&
update-alternatives --install "/usr/bin/javac" "javac" "${JAVA_HOME}/bin/javac" 1 &&
update-alternatives --set java "${JRE_HOME}/bin/java" &&
update-alternatives --set javac "${JAVA_HOME}/bin/javac"
WORKDIR /hello-dockerize
EXPOSE 8080
EXPOSE 5005
CMD ["bash"]
將dockerize/docker-entrypoint.sh移動到dockerize/mysql目錄下
Startup
修改docker-compose.yml:
web:
build: ./dockerize
environment:
- LANG=C.UTF-8
- TERM=xterm
- DEBUG=true
links:
- mysql:mysql
ports:
- "8080:8080"
- "5005:5005"
volumes:
- .:/hello-dockerize
mysql:
build: ./dockerize/mysql
env_file: ./dockerize/dev.env
ports:
- "3306:3306"
volumes:
- /var/lib/mysql:/var/lib/mysql
啟動容器：
$ docker-compose up
查看容器
$ docker-compse ps
######
Name Command State Ports
---------------------------------------------------------------------------------------------------------------
hellodockerize_mysql_1 docker-entrypoint.sh mysqld Up 0.0.0.0:3306->3306/tcp
hellodockerize_web_run_1 bash Up 0.0.0.0:5005->5005/tcp, 0.0.0.0:8080->8080/tcp
######
執(zhí)行 migrate 命令:
root@6485a7a48988:/hello-dockerize# ./gradlew flywayClean flywayInit flywayMigrate
Check Migrate Result On Intellij IDEA
查看 User 表
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