1、环境
Docker swarm集群（192.168.3.204【controller】，192.168.3.202【node2】, 192.168.3.201【node1】）
基础镜像：centos
构建应用: nginx 1.14.0
2、操作
创建目录：
mkdir -p /mnt/docker
创建dockerfile文件
cd /mnt/docker
touch Dockerfile
文件内容如下：
[root@controller docker]# cat Dockerfile
# Base image
FROM centos
# MAINTAINER
MAINTAINER farmer
# ADD
ADD nginx-1.14.0.tar.gz /usr/local/src
# RUN
RUN yum -y install wget gcc gcc-c++ make pcre pcre-devel zlib zlib-devel openssl-devel
RUN useradd -s /sbin/nologin -M nginx
# WORKDIR
WORKDIR /usr/local/src/nginx-1.14.0
RUN ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with- http_ssl_module --with-http_stub_status_module --with-pcre && make && make install
RUN echo "daemon off;" >> /usr/local/nginx/conf/nginx.conf
#ENV
ENV PATH /usr/local/nginx/sbin:$PATH
# EXPOSE
EXPOSE 80
# CMD
# CMD /bin/sh -c 'nginx -g "daemon off;"'
CMD ["nginx"]
指令说明：
FROM： 设置镜像使用的基础镜像
MAINTAINER：设置镜像的作者
CMD：设置容器的启动命令
LABEL：设置镜像的标签
EXPOSE：设置镜像暴露的端口
ENV：设置容器的环境变量
ADD：编译镜像时复制文件到镜像中
COPY：编译镜像时复制文件到镜像中
ENTRYPOINT：设置容器的入口程序
VOLUME：设置容器挂载卷
USER：设置运行RUN CMD ENTRYPOINT的用户名
WORKDIR：设置RUN CMD ENTRYPOINT COPY ADD指令的工作目录
ARG：设置编译镜像时加入的参数
ONBUILD：设置镜像的ONBUILD指令
STOPSIGNAL：设置容器退出的信息量
执行构建镜像：
cd /mnt/docker
docker build -t nginx:v1 .
构建完成查看镜像：
[root@controller docker]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
nginx v1 c67185cd9c7c About an hour ago 400 MB
centos latest 5182e96772bf 5 weeks ago 200 MB
nginx <none> c82521676580 7 weeks ago 109 MB
registry latest b2b03e9146e1 2 months ago 33.3 MB
设置Tag：
docker tag c67185cd9c7c 192.168.3.204:5000/nginx:v2
上传镜像：
[root@controller docker]# docker push 192.168.3.204:5000/nginx:v2
The push refers to a repository [192.168.3.204:5000/nginx]
d63b196c2272: Pushed
a8d5b5942f8b: Pushed
1e8da162852a: Pushed
33b640181c2f: Pushed
fac0ef479b31: Pushed
1d31b5806ba4: Pushed
v2: digest: sha256:daae58d543ef42e59d2808e4bde0ad5cf877f5cdbd5d5b2a9536cd6a7a674c51 size: 1580
查看镜像：
[root@controller docker]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
192.168.3.204:5000/nginx v2 c67185cd9c7c About an hour ago 400 MB
nginx v1 c67185cd9c7c About an hour ago 400 MB
centos latest 5182e96772bf 5 weeks ago 200 MB
nginx <none> c82521676580 7 weeks ago 109 MB
registry latest b2b03e9146e1 2 months ago 33.3 MB
Swarm集群创建Service：
[root@controller docker]# docker service create --replicas 2 --network nginx --name CL -p 8000:80 192.168.3.204:5000/nginx:v2
7x3ts5iyfamrkvzsoqfayqnfi
查看服务：
[root@controller docker]# docker service ls
ID NAME MODE REPLICAS IMAGE
7x3ts5iyfamr CL replicated 0/2 192.168.3.204:5000/nginx:v2
pj3vhyfuvz7i nginx replicated 2/2 nginx:latest
稍等一会儿在查看：
[root@controller docker]# docker service ls
ID NAME MODE REPLICAS IMAGE
7x3ts5iyfamr CL replicated 2/2 192.168.3.204:5000/nginx:v2
pj3vhyfuvz7i nginx replicated 2/2 nginx:latest
查看运行的节点：
[root@controller docker]# docker service ps CL
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
2kw03dx2b3iq CL.1 192.168.3.204:5000/nginx:v2 node1 Running Running 26 seconds ago
3nmsmknudn9u CL.2 192.168.3.204:5000/nginx:v2 node2 Running Running 25 seconds ago
打开浏览器查看：
image
