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Docker-Compose?容器集群的快速編排方法

發(fā)布日期:2022-07-15 19:47 | 文章來源:gibhub

Docker-Compose 容器集群的快速編排

Docker-compose 簡介

  • Docker-Compose項目是Docker官方的開源項目,負(fù)責(zé)實現(xiàn)對Docker容器集群的快速編排。
  • Docker-Compose將所管理的容器分為三層,分別是 工程(project),服務(wù)(service)以及容器(container)。Docker-Compose運行目錄下的所有文件(docker-compose.yml,extends文件或環(huán)境變量文件等)組成一個工程,若無特殊指定工程名即為當(dāng)前目錄名。一個工程當(dāng)中可包含多個服務(wù),每個服務(wù)中定義了容器運行的鏡像、參數(shù)、依賴。一個服務(wù)當(dāng)中可包括多個容器實例,Docker-Compose并沒有解決負(fù)載均衡的問題,因此需要借助其它工具實現(xiàn)服務(wù)發(fā)現(xiàn)及負(fù)載均衡,比如 Consul。
  • Docker-Compose的工程配置文件默認(rèn)為docker-compose.yml,可通過環(huán)境變量COMPOSE_FILE或-f參數(shù)自定義配置文件,其定義了多個有依賴關(guān)系的服務(wù)及每個服務(wù)運行的容器。
  • 使用一個Dockerfile模板文件,可以讓用戶很方便的定義一個單獨的應(yīng)用容器。在工作中,經(jīng)常會碰到需要多個容器相互配合來完成某項任務(wù)的情況。例如要實現(xiàn)一個Web項目,除了Web服務(wù)容器本身,往往還需要再加上后端的數(shù)據(jù)庫服務(wù)容器,甚至還包括負(fù)載均衡容器等。
  • Compose允許用戶通過一個單獨的docker-compose.yml模板文件(YAML 格式)來定義一組相關(guān)聯(lián)的應(yīng)用容器為一個項目(project)。
  • Docker-Compose項目由Python編寫,調(diào)用Docker服務(wù)提供的API來對容器進(jìn)行管理。因此,只要所操作的平臺支持Docker API, 就可以在其上利用Compose來進(jìn)行編排管理。

compose 部署

Docker Compose 環(huán)境安裝

Docker Compose 是 Docker 的獨立產(chǎn)品,因此需要安裝 Docker 之后在單獨安裝 Docker Compose

#下載
curl -L https://github.com/docker/compose/releases/download/1.21.1/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose 
#或者已下載過直接從宿主機(jī)傳入到/opt目錄下 
mv docker-compose /usr/local/bin/ 
#安裝 
chmod +x /usr/local/bin/docker-compose 
#查看版本
docker-compose --version 

YAML 文件格式及編寫注意事項

  • YAML 是一種標(biāo)記語言,它可以很直觀的展示數(shù)據(jù)序列化格式,可讀性高。類似于 XML數(shù)據(jù)描述語言,語法比 XML 簡單的很多。YAML 數(shù)據(jù)結(jié)構(gòu)通過縮進(jìn)來表示,連續(xù)的項目通過減號來表示,鍵值對用冒號分隔,數(shù)組用中括號 [ ] 括起來, hash 用花括號 { } 括起來。
  • YAML 文件格式及編寫注意事項
  • 大小與敏感
  • 通過縮進(jìn)表示層級關(guān)系
  • 不支持制表符tab鍵縮進(jìn),只能使用空格縮進(jìn)
  • 縮進(jìn)的空格數(shù)目不重要,只要相同層級左對齊,通常開頭縮進(jìn)2個空格
  • 用#號注釋
  • 符號字符后縮進(jìn)1個空格,如冒號:、逗號,、橫杠-

Docker Compose配置常用字段

字段描述
build指定Dockerfile文件名(要指定的Dockerfile文件需要在build標(biāo)簽的子級標(biāo)簽中用dockerfile標(biāo)簽指定)
dockerfile構(gòu)建鏡像上下文路徑
context可以是dockerfile路徑,或者是執(zhí)行g(shù)it 倉庫的url地址
image指定鏡像(已存在)
command執(zhí)行命令,會覆蓋容器啟動后默認(rèn)執(zhí)行的命令(會覆蓋Dockerfile的CMD指令)
container_name指定容器名稱,由于容器名稱是唯一的,如果指定自定義名稱,則無法scale
deploy指定部署和運行服務(wù)相關(guān)配置,只能在Swarm模式使用
enviroment添加環(huán)境變量
networks加入網(wǎng)絡(luò),引用頂級networks下條目
networks-mode設(shè)置容器的網(wǎng)絡(luò)模式,host、bridge.....
ports暴露容器端口,與-p 相同,但是端口不能低于60
volumes掛載一個宿主機(jī)目錄或命令卷到容器,命名卷要在頂級volumes 定義卷名稱
volumes_from從另一個服務(wù)或容器掛載卷,可選參數(shù) :ro 和 :rw,僅版本'2'支持
hostname容器主機(jī)名
sysctls在容器內(nèi)設(shè)置內(nèi)核參數(shù)
links連接到另一個容器,- 服務(wù)名稱[ :服務(wù)別名 ]
privilcgcd用來給容器root權(quán)限,注意是不安全的,truc|false(開啟|關(guān)閉)
restart重啟策略,定義是否重啟容器; no(默認(rèn),不重啟), always(總是重啟), on-failure,(退出狀態(tài)非0時重啟), on-failure:3 ,在容器非正常退出時重啟容器,最多重啟3次, unless-stoped 在容器退出時總是重啟容器,但是不考慮在Docker 守護(hù)進(jìn)程啟動時就已經(jīng)停止了的容器
depends_on此標(biāo)簽用于解決容器的依賴,啟動先后問題。如啟動應(yīng)用容器,需要先啟動數(shù)據(jù)庫容器php: depends_on: - apache - mysql

Docker compose 常用命令字段

字段描述
build重新構(gòu)建服務(wù)
ps列出容器
up創(chuàng)建和啟動容器
exec在容器里面執(zhí)行命令
scale指定一個服務(wù)容器啟動數(shù)量
top顯示正在運行的容器進(jìn)程
logs查看服務(wù)容器的輸出
down刪除容器、網(wǎng)絡(luò)、數(shù)據(jù)卷和鏡像
stop/start/restart停止/啟動/重啟服務(wù)

編寫Docker Compose搭建lnmp論壇

部署前準(zhǔn)備
vim /etc/sysctl.conf
net.ipv4.ip_forward = 1           #末行添加
sysctl -p                         #刷新配置
systemctl restart docker          #重啟docker服務(wù)

配置nginx
編寫dockerfile文件
FROM centos:7
MAINTAINER this is nginx images<gb>
RUN yum -y install pcre-devel zlib-devel gcc gcc-c++ make
RUN useradd -M -s /sbin/nologin nginx
ADD nginx-1.12.0.tar.gz /opt/
WORKDIR /opt/nginx-1.12.0/
RUN ./configure \
--prefix=/usr/local/nginx \
--user=nginx \
--group=nginx \
--with-http_stub_status_module && make -j4 &&  make install
ENV PATH $PATH:/usr/local/nginx/sbin
ADD nginx.conf /usr/local/nginx/conf/
RUN chmod 777 -R /usr/local/nginx/html/
EXPOSE 80
EXPOSE 443
CMD ["/usr/local/nginx/sbin/nginx", "-g", "daemon off;"]

準(zhǔn)備配置好nginx配置文件(添加支持php解析配置)

#user  nobody;
worker_processes  1;
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;
#pid        logs/nginx.pid;
events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
#log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
#                  '$status $body_bytes_sent "$http_referer" '
#                  '"$http_user_age

配置mysql

準(zhǔn)備配置文件
vim my.cnf
[client]
port = 3306
socket=/usr/local/mysql/mysql.sock
[mysqld]
user = mysql
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
port = 3306
character-set-server=utf8
pid-file = /usr/local/mysql/mysqld.pid
socket=/usr/local/mysql/mysql.sock
bind-address = 0.0.0.0
skip-name-resolve
max_connections=2048
default-storage-engine=INNODB
max_allowed_packet=16M
server-id = 1
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,PIPES_AS_CONCAT,ANSI_QUOTES
編寫dockerfile文件
FROM centos:7
MAINTAINER this is mysql image <lnmp>
RUN yum -y install gcc gcc-c++ ncurses ncurses-devel bison cmake make;useradd -M -s /sbin/nologin mysql
ADD mysql-boost-5.7.20.tar.gz /usr/local/src/
WORKDIR /usr/local/src/mysql-5.7.20/
RUN cmake \
-DCMAKE_INSTALL_PREFIX=/usr/local/mysql \
-DMYSQL_UNIX_ADDR=/usr/local/mysql/mysql.sock \
-DSYSCONFDIR=/etc \
-DSYSTEMD_PID_DIR=/usr/local/mysql \
-DDEFAULT_CHARSET=utf8  \
-DDEFAULT_COLLATION=utf8_general_ci \
-DWITH_EXTRA_CHARSETS=all \
-DWITH_INNOBASE_STORAGE_ENGINE=1 \
-DWITH_ARCHIVE_STORAGE_ENGINE=1 \
-DWITH_BLACKHOLE_STORAGE_ENGINE=1 \
-DWITH_PERFSCHEMA_STORAGE_ENGINE=1 \
-DMYSQL_DATADIR=/usr/local/mysql/data \
-DWITH_BOOST=boost \
-DWITH_SYSTEMD=1;make -j 4;make install
ADD my.cnf /etc/my.cnf
EXPOSE 3306
RUN chown -R mysql:mysql /usr/local/mysql/;chown mysql:mysql /etc/my.cnf
WORKDIR /usr/local/mysql/bin/
RUN ./mysqld \
--initialize-insecure \
--user=mysql \
--basedir=/usr/local/mysql \
--datadir=/usr/local/mysql/data;cp /usr/local/mysql/usr/lib/systemd/system/mysqld.service /usr/lib/systemd/system/;systemctl enable mysqld
ENV PATH=/usr/local/mysql/bin:/usr/local/mysql/lib:$PATH
VOLUME [ "/usr/local/mysql" ]
CMD ["/usr/sbin/init"]

配置php

編寫Dockerfile文件

FROM centos:7
MAINTAINER this is php image <lnmp>
RUN yum install -y gd \
libjpeg libjpeg-devel \
libpng libpng-devel \
freetype freetype-devel \
libxml2 libxml2-devel \
zlib zlib-devel \
curl curl-devel \
openssl openssl-devel \
gcc gcc-c++ make pcre-devel;useradd -M -s /sbin/nologin nginx
ADD php-7.1.10.tar.bz2 /usr/local/src/
WORKDIR /usr/local/src/php-7.1.10
RUN ./configure \
--prefix=/usr/local/php \
--with-mysql-sock=/usr/local/mysql/mysql.sock \
--with-mysqli \
--with-zlib \
--with-curl \
--with-gd \
--with-jpeg-dir \
--with-png-dir \
--with-freetype-dir \
--with-openssl \
--enable-fpm \
--enable-mbstring \
--enable-xml \
--enable-session \
--enable-ftp \
--enable-pdo \
--enable-tokenizer \
--enable-zip ; make -j 4 ; make install
ENV PATH /usr/local/php/bin:/usr/local/php/sbin:$PATH
ADD php.ini /usr/local/php/lib/
ADD php-fpm.conf /usr/local/php/etc/
RUN rm -rf /usr/local/php/etc/php-fpm.d/www.conf.default
ADD www.conf /usr/local/php/etc/php-fpm.d/
EXPOSE 9000
CMD /usr/local/php/sbin/php-fpm -F

將所需的三個配置文件修改后寫入

vim php-fpm.conf
[global]
pid = run/php-fpm.pid
include=/usr/local/php/etc/php-fpm.d/*.conf
vim php.ini
[PHP]
engine = On
short_open_tag = Off
precision = 14
output_buffering = 4096
zlib.output_compression = Off
implicit_flush = Off
unserialize_callback_func =
serialize_precision = -1
disable_functions =
disable_classes =
zend.enable_gc = On
expose_php = On
max_execution_time = 30
max_input_time = 60
memory_limit = 128M
error_reporting = E_ALL
display_errors = On
display_startup_errors = On
log_errors = On
log_errors_max_len = 1024
ignore_repeated_errors = Off
ignore_repeated_source = Off
report_memleaks = On
track_errors = On
html_errors = On
variables_order = "GPCS"
request_order = "GP"
register_argc_argv = Off
auto_globals_jit = On
post_max_size = 8M
auto_prepend_file =
auto_append_file =
default_mimetype = "text/html"
default_charset = "UTF-8"
doc_root =
user_dir =
enable_dl = Off
file_uploads = On
upload_max_filesize = 2M
max_file_uploads = 20
allow_url_fopen = On
allow_url_include = Off
default_socket_timeout = 60
[CLI Server]
cli_server.color = On
[Date]
date.timezone = Asia/Shanghai
[filter]
[iconv]
[intl]
[sqlite3]
[Pcre]
[Pdo]
[Pdo_mysql]
pdo_mysql.cache_size = 2000
pdo_mysql.default_socket=
[Phar]
[mail function]
SMTP = localhost
smtp_port = 25
mail.add_x_header = On
[SQL]
sql.safe_mode = Off
[ODBC]
odbc.allow_persistent = On
odbc.check_persistent = On
odbc.max_persistent = -1
odbc.max_links = -1
odbc.defaultlrl = 4096
odbc.defaultbinmode = 1
[Interbase]
ibase.allow_persistent = 1
ibase.max_persistent = -1
ibase.max_links = -1
ibase.timestampformat = "%Y-%m-%d %H:%M:%S"
ibase.dateformat = "%Y-%m-%d"
ibase.timeformat = "%H:%M:%S"
[MySQLi]
mysqli.max_persistent = -1
mysqli.allow_persistent = On
mysqli.max_links = -1
mysqli.cache_size = 2000
mysqli.default_port = 3306
mysqli.default_socket = /usr/local/mysql/mysql.sock
mysqli.default_host =
mysqli.default_user =
mysqli.default_pw =
mysqli.reconnect = Off
[mysqlnd]
mysqlnd.collect_statistics = On
mysqlnd.collect_memory_statistics = On
[OCI8]
[PostgreSQL]
pgsql.allow_persistent = On
pgsql.auto_reset_persistent = Off
pgsql.max_persistent = -1
pgsql.max_links = -1
pgsql.ignore_notice = 0
pgsql.log_notice = 0
[bcmath]
bcmath.scale = 0
[browscap]
[Session]
session.save_handler = files
session.use_strict_mode = 0
session.use_cookies = 1
session.use_only_cookies = 1
session.name = PHPSESSID
session.auto_start = 0
session.cookie_lifetime = 0
session.cookie_path = /
session.cookie_domain =
session.cookie_httponly =
session.serialize_handler = php
session.gc_probability = 1
session.gc_divisor = 1000
session.gc_maxlifetime = 1440
session.referer_check =
session.cache_limiter = nocache
session.cache_expire = 180
session.use_trans_sid = 0
session.sid_length = 26
session.trans_sid_tags = "a=href,area=href,frame=src,form="
session.sid_bits_per_character = 5
[Assertion]
zend.assertions = 1
[COM]
[mbstring]
[gd]
[exif]
[Tidy]
tidy.clean_output = Off
[soap]
soap.wsdl_cache_enabled=1
soap.wsdl_cache_dir="/tmp"
soap.wsdl_cache_ttl=86400
soap.wsdl_cache_limit = 5
[sysvshm]
[ldap]
ldap.max_links = -1
[mcrypt]
[dba]
[opcache]
[curl]
[openssl]
vim php-fpm.conf
[global]
pid = run/php-fpm.pid
include=/usr/local/php/etc/php-fpm.d/*.conf
折疊 
vim www.conf
[www]
user = nginx
group = nginx
listen = 172.18.0.30:9000
pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3

編寫docker-compose.yml文件

version: '2'
services:
  nginx:
    container_name: nginx
    build:
      context: ./nginx
      dockerfile: Dockerfile
    ports:
    - 80:80
    networks:
      lnmp:
        ipv4_address: 172.18.0.10
  mysql:
    container_name: mysql
    privileged: true
    build:
      context: ./mysql
      dockerfile: Dockerfile
    ports:
   - 3306:3306
     networks:
          lnmp:
     ipv4_address: 172.18.0.20
       php:
         depends_on:
     - nginx
     - mysql
       build:
       context: ./php
       dockerfile: Dockerfile
       container_name: php
       ports:
     - 9000:9000
       networks:
       lnmp:
       ipv4_address: 172.18.0.30
         volumes_from:
     - nginx
     - mysql
networks:
  lnmp:
    driver: bridge
    ipam:
      config:
      - subnet: 172.18.0.0/16
折疊 
#啟動容器
docker-compose -f docker-compose.yml up -d
docker ps -a

到此這篇關(guān)于Docker-Compose容器集群的快速編排的文章就介紹到這了,更多相關(guān)DockerCompose容器集群內(nèi)容請搜索本站以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持本站!

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