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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,負責實現對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(service)以及容器(container)。Docker-Compose運行目錄下的所有文件(docker-compose.yml,extends文件或環境變量文件等)組成一個工程,若無特殊指定工程名即為當前目錄名。一個工程當中可包含多個服務,每個服務中定義了容器運行的鏡像、參數、依賴。一個服務當中可包括多個容器實例,Docker-Compose并沒有解決負載均衡的問題,因此需要借助其它工具實現服務發現及負載均衡,比如 Consul。
- Docker-Compose的工程配置文件默認為docker-compose.yml,可通過環境變量COMPOSE_FILE或-f參數自定義配置文件,其定義了多個有依賴關系的服務及每個服務運行的容器。
- 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用容器。在工作中,經常會碰到需要多個容器相互配合來完成某項任務的情況。例如要實現一個Web項目,除了Web服務容器本身,往往還需要再加上后端的數據庫服務容器,甚至還包括負載均衡容器等。
- Compose允許用戶通過一個單獨的docker-compose.yml模板文件(YAML 格式)來定義一組相關聯的應用容器為一個項目(project)。
- Docker-Compose項目由Python編寫,調用Docker服務提供的API來對容器進行管理。因此,只要所操作的平臺支持Docker API, 就可以在其上利用Compose來進行編排管理。
compose 部署
Docker Compose 環境安裝
Docker Compose 是 Docker 的獨立產品,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 是一種標記語言,它可以很直觀的展示數據序列化格式,可讀性高。類似于 XML數據描述語言,語法比 XML 簡單的很多。YAML 數據結構通過縮進來表示,連續的項目通過減號來表示,鍵值對用冒號分隔,數組用中括號 [ ] 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
- 通過縮進表示層級關系
- 不支持制表符tab鍵縮進,只能使用空格縮進
- 縮進的空格數目不重要,只要相同層級左對齊,通常開頭縮進2個空格
- 用#號注釋
- 符號字符后縮進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標簽的子級標簽中用dockerfile標簽指定) |
dockerfile | 構建鏡像上下文路徑 |
context | 可以是dockerfile路徑,或者是執行git 倉庫的url地址 |
image | 指定鏡像(已存在) |
command | 執行命令,會覆蓋容器啟動后默認執行的命令(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相關配置,只能在Swarm模式使用 |
enviroment | 添加環境變量 |
networks | 加入網絡,引用頂級networks下條目 |
networks-mode | 設置容器的網絡模式,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 | 從另一個服務或容器掛載卷,可選參數 :ro 和 :rw,僅版本'2'支持 |
hostname | 容器主機名 |
sysctls | 在容器內設置內核參數 |
links | 連接到另一個容器,- 服務名稱[ :服務別名 ] |
privilcgcd | 用來給容器root權限,注意是不安全的,truc|false(開啟|關閉) |
restart | 重啟策略,定義是否重啟容器; no(默認,不重啟), always(總是重啟), on-failure,(退出狀態非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 守護進程啟動時就已經停止了的容器 |
depends_on | 此標簽用于解決容器的依賴,啟動先后問題。如啟動應用容器,需要先啟動數據庫容器php: depends_on: - apache - mysql |
Docker compose 常用命令字段
字段 | 描述 |
---|---|
build | 重新構建服務 |
ps | 列出容器 |
up | 創建和啟動容器 |
exec | 在容器里面執行命令 |
scale | 指定一個服務容器啟動數量 |
top | 顯示正在運行的容器進程 |
logs | 查看服務容器的輸出 |
down | 刪除容器、網絡、數據卷和鏡像 |
stop/start/restart | 停止/啟動/重啟服務 |
編寫Docker Compose搭建lnmp論壇
部署前準備
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
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" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
server {
listen 80;
server_name localhost;
charset utf-8;
#access_log logs/host.access.log main;
location / {
root html;
index index.html index.php;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
location ~ \.php$ {
root html;
fastcgi_pass 172.18.0.30:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /usr/local/nginx/html$fastcgi_script_name;
include fastcgi_params;
}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}
折疊
配置mysql
準備配置文件
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
原文鏈接:https://www.cnblogs.com/DavinWw/p/16472433.html
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