环境信息
centos7.2
目录
Docker安装/docker实现Mysql主从复制参考地址
通过配置文件修改docker容器端口映射
docker实现项目的负载均衡集群
通过配置文件修改docker容器端口映射
Docker安装/docker实现Mysql主从复制参考地址通过配置文件修改docker容器端口映射参考地址(精)Docker容器内部端口映射到外部宿主机端口的方法小结
有时候，我们需要给正在运行的容器添加端口映射，百度一下发现很多都是通过iptables，或者是通过将当前容器通过docker commit命令提交为一个镜像，然后重新执行docker run命令添加端口映射。这种方法虽然可以，但是感觉好像有点南辕北辙，没有必要啊。看了很多文章，貌似没有一种合适的办法可以相对“优雅”地解决这个问题。
注意：
宿主机的一个端口只能映射到容器内部的某一个端口上，比如：8080->80之后，就不能8080->81
容器内部的某个端口可以被宿主机的多个端口映射,比如：8080->80，8090->80,8099->80
修改DOCKER端口映射步骤
1、使用 docker ps -a 命令找到要修改容器的 CONTAINER ID
2、运行 docker inspect 【CONTAINER ID】 | grep Id 命令
3、执行 cd /var/lib/docker/containers 命令进入找到与 Id 相同的目录，如下图
4、停止 docker 引擎服务，systemctl stop docker 或者 service docker stop
5、进入对应 Id 所在目录后，如上图所示，修改 hostconfig.json 和 config.v2.json ---- vi hostconfig.json
可以看到格式很乱，可以使用json美化工具查看具体信息。
然后可以按照方框中所示，再添加一段类似的内容，比如新增一个 80 端口，在 PortBindings下边添加一下内容，端口配置之间用英文字符逗号隔开
"80/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "80"
}
]接着修改 vi config.v2.json
找到 ExposedPorts 和 Ports 对应项，还是仿照原先的内容添加自己所需要的端口映射
========================================================================
========================================================================
保存之后 systemctl start docker ，启动容器之后就可以看到新增的端口映射了。
配置案例
例如下面的是分别把宿主机的3306端口映射到容器的3306
把宿主机的8084端口映射到容器的8085端口
宿主机的一个端口可以被多个容器端口进行监听
- config.v2.json
{
"StreamConfig": { },
"State": {
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"RemovalInProgress": false,
"Dead": false,
"Pid": 7758,
"ExitCode": 0,
"Error": "",
"StartedAt": "2019-03-02T02:35:48.538300741Z",
"FinishedAt": "2019-03-01T07:16:15.64603722Z",
"Health": null
},
"ID": "7187b75620b4fa53f5bdaf4e50de0c7e9a152a261c7da1494139a50a7f65db74",
"Created": "2019-02-27T12:36:58.831703086Z",
"Managed": false,
"Path": "/usr/sbin/init",
"Args": [ ],
"Config": {
"Hostname": "7187b75620b4",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"3306/tcp": { },
"8084/tcp": { }
},
"Tty": true,
"OpenStdin": true,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/usr/sbin/init"
],
"Image": "1e1148e4cc2c",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"org.label-schema.build-date": "20181205",
"org.label-schema.license": "GPLv2",
"org.label-schema.name": "CentOS Base Image",
"org.label-schema.schema-version": "1.0",
"org.label-schema.vendor": "CentOS"
}
},
"Image": "sha256:1e1148e4cc2c148c6890a18e3b2d2dde41a6745ceb4e5fe94a923d811bf82ddb",
"NetworkSettings": {
"Bridge": "",
"SandboxID": "357f85e1a5521d83e0c801d960f039049999e626b53de452f9beefc910e3413e",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "b36eada156be7ce2d227cbcfe6c5864fdff69b5158411ab14e51738a9ac854fa",
"EndpointID": "3b80e8660c842622866614b6eee9755e4ba58707df28041eb7b3ddacda805b62",
"Gateway": "172.18.0.1",
"IPAddress": "172.18.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:12:00:02",
"IPAMOperational": false
}
},
"Service": null,
"Ports": {
"3306/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "3306"
}
],
"8084/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "8085"
}
]
},
"SandboxKey": "/var/run/docker/netns/357f85e1a552",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"IsAnonymousEndpoint": false,
"HasSwarmEndpoint": false
},
"LogPath": "",
"Name": "/mysql-master",
"Driver": "overlay2",
"MountLabel": "",
"ProcessLabel": "",
"RestartCount": 0,
"HasBeenStartedBefore": true,
"HasBeenManuallyStopped": false,
"MountPoints": { },
"SecretReferences": null,
"AppArmorProfile": "",
"HostnamePath": "/var/lib/docker/containers/7187b75620b4fa53f5bdaf4e50de0c7e9a152a261c7da1494139a50a7f65db74/hostname",
"HostsPath": "/var/lib/docker/containers/7187b75620b4fa53f5bdaf4e50de0c7e9a152a261c7da1494139a50a7f65db74/hosts",
"ShmPath": "/var/lib/docker/containers/7187b75620b4fa53f5bdaf4e50de0c7e9a152a261c7da1494139a50a7f65db74/shm",
"ResolvConfPath": "/var/lib/docker/containers/7187b75620b4fa53f5bdaf4e50de0c7e9a152a261c7da1494139a50a7f65db74/resolv.conf",
"SeccompProfile": "",
"NoNewPrivileges": false
}- hostconfig.json
{
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "journald",
"Config": { }
},
"NetworkMode": "default",
"PortBindings": {
"3306/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "3306"
}
],
"8084/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "8085"
}
]
},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Dns": [ ],
"DnsOptions": [ ],
"DnsSearch": [ ],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "",
"Cgroup": "",
"Links": [ ],
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "docker-runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": null,
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [ ],
"DiskQuota": 0,
"KernelMemory": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": -1,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0
}docker实现项目的负载均衡集群
安装docker,参考目录第一个
容器安装两个以上/并且容器中运行自己的项目(进行宿主机端口与docker容器主机端口映射【也可采用端口映射】)
宿主机安装nginx
宿主机配置负载均衡(配置可以参考链接（精）死磕nginx系列–使用nginx做负载均衡)
配置说明
1.nginx的配置(nginx.conf)
# For more information on configuration, see:
# * Official English Documentation: http://nginx.org/en/docs/
# * Official Russian Documentation: http://nginx.org/ru/docs/
user nginx;
#（默认为自动，可以自己设置，一般不大于cpu核数）
worker_processes auto;
#（错误日志路径)
error_log /var/log/nginx/error.log;
#（pid文件路径）
pid /run/nginx.pid;
# Load dynamic modules. See /usr/share/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;
events {
#（设置网路连接序列化，防止惊群现象发生，默认为on）
accept_mutex on;
#（设置一个进程是否同时接受多个网络连接，默认为off）
multi_accept on;
#（一个进程的最大连接数）
worker_connections 1024;
}
http {
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 /var/log/nginx/access.log main;
#（这里注释掉）
#tcp_nopush on;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##配置信息
charset utf-8;
server_names_hash_bucket_size 128;
large_client_header_buffers 4 64k;
client_max_body_size 16m;
client_body_buffer_size 128k;
client_header_buffer_size 32k;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_connect_timeout 300;
proxy_read_timeout 300;
proxy_send_timeout 300;
##（连接超时时间）
keepalive_timeout 120;
proxy_buffers 4 32k;
proxy_buffer_size 64k;
proxy_busy_buffers_size 64k;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
fastcgi_buffer_size 64k;
fastcgi_buffers 4 64k;
fastcgi_busy_buffers_size 128k;
fastcgi_temp_file_write_size 128k;
#开启压缩
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.0;
gzip_comp_level 2;
gzip_types text/plain application/x-javascript text/css application/xml;
gzip_vary on;
underscores_in_headers on;
limit_req_zone $binary_remote_addr zone=one:10m rate=10r/s;
log_format access '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
#附加配置，暂不设置
#lua_package_path "/data/nginx/conf/waf/?.lua";
#init_by_lua_file /data/nginx/conf/waf/init.lua;
#access_by_lua_file /data/nginx/conf/waf/waf.lua;
#lua_shared_dict limit 10m;
# Load modular configuration files from the /etc/nginx/conf.d directory.
# See http://nginx.org/en/docs/ngx_core_module.html#include
# for more information.
#这里我引用了配置
include /etc/nginx/conf.d/*.conf;
#include /etc/nginx/conf.d/kunzainginx.conf;
# 这里设置负载均衡，负载均衡有多种策略，nginx自带的有轮询，权重，ip-hash，响应时间等策略。
# 默认为平分http负载，为轮询的方式。
# 权重则是按照权重来分发请求，权重高的负载大
# ip-hash，根据ip来分配，保持同一个ip分在同一台服务器上。
# 响应时间，根据服务器都nginx 的响应时间，优先分发给响应速度快的服务器。
#集中策略可以适当组合
#upstream tomcat { #（tomcat为自定义的负载均衡规则名,可以自己定义,但是需要和【server->location->proxy_pass中(http://******;)的******(自定义)一致】）
#ip_hash; #（ip_hash则为ip-hash方法）
#server 192.168.14.132:8080 weight=5; #（weihgt为权重）
#server 192.168.14.133:8080 weight=3;
## 可以定义多组规则
#}
#server {
#（默认监听80端口）
#listen 80 default_server;
#(server_name我这边填写的是客户端访问的域名如baidu.com)
#server_name _;
#root /usr/share/nginx/html;
# Load configuration files for the default server block.
#include /etc/nginx/default.d/*.conf;
#（ / 表示所有请求，可以自定义来针对不同的域名设定不同负载规则 和服务）
#location / {
# proxy_pass http://tomcat; （反向代理，填上你自己的负载均衡规则名）
# proxy_redirect off; （下面一些设置可以直接复制过去，不要的话，有可能导致一些 没法认证等的问题）
# proxy_set_header Host $host;
#proxy_set_header X-Real-IP $remote_addr;
#proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
#proxy_connect_timeout 90; （下面这几个都只是一些超时设置，可不要）
#proxy_send_timeout 90;
#proxy_read_timeout 90;
# }
# location ~\.(gif|jpg|png)$ { （比如，以正则表达式写）
# root /home/root/images;
# }
#error_page 404 /404.html;
# location = /40x.html {
#}
#error_page 500 502 503 504 /50x.html;
# location = /50x.html {
#}
}
# Settings for a TLS enabled server.
#
# server {
# listen 443 ssl http2 default_server;
# listen [::]:443 ssl http2 default_server;
# server_name _;
# root /usr/share/nginx/html;
#
# ssl_certificate "/etc/pki/nginx/server.crt";
# ssl_certificate_key "/etc/pki/nginx/private/server.key";
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 10m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
#
# # Load configuration files for the default server block.
# include /etc/nginx/default.d/*.conf;
#
# location / {
# }
#
# error_page 404 /404.html;
# location = /40x.html {
# }
#
# error_page 500 502 503 504 /50x.html;
# location = /50x.html {
# }
# }
#}下面是上面配置的引用（include /etc/nginx/conf.d/*.conf;）
下面文件的所在/etc/nginx/conf.d/proxynginx.conf
主要该文件最下面两端的配置
server{
listen 80;
server_name test.cn;
location / {
proxy_pass http://127.0.0.1（宿主ip）:8080;
proxy_set_header User-Agent $http_user_agent;
root /usr/local/java/apache-tomcat-8.0.47-jenkins/webapps/love;
index /pages/index.jsp;
access_log /usr/local/java/apache-tomcat-8.0.47-jenkins/webapps/love/access.log;
}
error_page 404 /404.html;
location = /40x.html {}
error_page 500 502 503 504 /50x.html;
location = /50x.html {}
}
##eureka项目
server{
listen 80;
server_name eureka.test.cn;
location / {
proxy_pass http://127.0.0.1（宿主ip）:8761;
proxy_set_header User-Agent $http_user_agent;
root /usr/local/java/eureka;
index /;
access_log /usr/local/java/eureka/access.log;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
##image项目
server{
listen 80;
server_name image.test.cn;
location / {
proxy_pass http://127.0.0.1（宿主ip）:8083;
proxy_set_header User-Agent $http_user_agent;
root /usr/local/java/eureka;
index /;
access_log /usr/local/java/boot/base-oss/access.log;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
##nexus项目
server{
listen 80;
server_name nexus.test.cn;
location / {
proxy_pass http://127.0.0.1（宿主ip）:12345;
proxy_set_header User-Agent $http_user_agent;
index /;
access_log /usr/local/java/nexus/logs/access.log;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
##invitation项目
server{
listen 80;
server_name geer.test.cn;
location / {
proxy_pass http://127.0.0.1（宿主ip）:8081;
proxy_set_header User-Agent $http_user_agent;
root /usr/local/java/eureka;
index /;
access_log /usr/local/java/boot/boot-invitation/access.log;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
##cat监控项目
server{
listen 80;
server_name cat.test.cn;
location / {
proxy_pass http://localhost:9090;
proxy_set_header User-Agent $http_user_agent;
index /;
#access_log /usr/local/java/cat/access.log;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
##activeMq项目
server{
listen 80;
server_name activemq.test.cn;
location / {
proxy_pass http://127.0.0.1（宿主ip）:8161;
proxy_set_header User-Agent $http_user_agent;
root /usr/local/java/apache-activemq-5.15.4;
index /;
access_log /usr/local/java/apache-activemq-5.15.4/access.log;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
#
#
#负载均衡的实现见下面两段
#
#这里的域名要和下面proxy_pass的一样
upstream encry {
#这里的ip是两个不同docker容器的IP地址
server 172.18.0.2:8084 weight=1;
server 172.18.0.3:8085 weight=2;
}
##encryprion加密项目
server{
listen 80;
server_name encry.test.cn;
location / {
#这里面的encry是随意起的
proxy_pass http://encry;
#proxy_pass http://localhost:8084;
proxy_set_header User-Agent $http_user_agent;
index /;
access_log /usr/local/java/boot/encryption/access.log;
}
error_page 404 /404.html;
location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
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