confd管理nginx配置

#下载confd
wget https://github.com/kelseyhightower/confd/releases/download/v0.16.0/confd-0.16.0-linux-amd64
mv confd-0.16.0-linux-amd64 /usr/bin/confd
chmod +x /usr/bin/confd
#检测是否安装成功
confd --version
confd 0.16.0 (Git SHA: 7217b0ca, Go Version: go1.10.2)

#confd的配置文件，主要包含配置的生成逻辑，例如模板源，后端存储对应的keys，命令执行等。
#templates:配置模板Template，即基于不同组件的配置，修改为go语言的模板文件
mkdir -p /etc/confd/{conf.d,templates}

#nginx需配置check_status后端检测（模块的编译以及配置已经在nginx初始化脚本里，按道理是应该是妥妥的)
#获取方式为http://IP/view/?format=json
location /view {
        check_status;
        access_log off;
    }

#启动confd,每隔5秒轮询一次，并根据CMDB的etcd传入的json数组动态生成配置文件
nohup confd -interval=5 -backend etcd -node http://192.168.1.11:2379 -node http://192.168.1.12:2379 -node http://192.168.1.13:2379  >> /data/confd.log &

cat > /etc/confd/conf.d/behavior-nginx.toml <<EOF
[template]
src = "nginx.tmpl"
dest = "/usr/local/nginx/conf/vhost/up.conf"
owner = "root"
keys = [
  "/behavior",
  "/kuasheng-gzzs"
]
reload_cmd = "/usr/local/nginx/sbin/nginx -s reload"
EOF

#cat /etc/confd/templates/nginx.tmpl
#增加完Key后，修改UPstream的配置模板，复制存在的UPstream，修改对应的UPstream名字即可，其它保持一样

cat > /etc/confd/templates/nginx.tmpl <<EOF
upstream behavior{
        {{range jsonArray (getv "/behavior")}}
        server {{ .}} max_fails=2 fail_timeout=40s weight=10;
        {{end}}
        check_http_send "HEAD /info HTTP/1.0\r\n\r\n";
        check interval=3000 rise=2 fall=5 timeout=1000 type=http;
}
upstream  kuasheng-gzzs{
       {{range jsonArray (getv "/kuasheng-gzzs")}}
       server {{ .}} max_fails=2 fail_timeout=40s weight=10;
       {{end}}
       check_http_send "HEAD /interiorappapi/actuator/info HTTP/1.0\r\n\r\n";
       check interval=3000 rise=2 fall=5 timeout=1000 type=http;
}
EOF

cat > /usr/local/nginx/conf/vhost/up.conf <<EOF
server {
    listen 80;
    server_name localhost;

    location /view {
        check_status;
        access_log off;
    }

    location /api/kuasheng/behavior {
        proxy_pass http://behavior/;
    }

    location /interiorappapi/ {
        proxy_pass http://kuasheng-gzzs;
    }
    error_page  502 /502.json;
    location /502.json {
    }
    error_page  404 /404.json;
    location /404.json {
    }
}
EOF

#添加behavior和kuasheng-gzzs值

etcdctl -C http://192.168.1.11:2379 set /behavior "[\"192.168.1.11:10900\", \"192.168.1.12:10900\"]"
etcdctl -C http://192.168.1.11:2379 set /kuasheng-gzzs "[\"192.168.1.11:80\", \"192.168.1.12:80\"]"

#自动生成 /usr/local/nginx/conf/vhost/up.conf文件

upstream behavior{

server 192.168.1.11:10900 max_fails=2 fail_timeout=40s weight=10;

server 192.168.1.20:10900 max_fails=2 fail_timeout=40s weight=10;

check_http_send "HEAD /info HTTP/1.0\r\n\r\n";
check interval=3000 rise=2 fall=5 timeout=1000 type=http;
}
upstream kuasheng-gzzs{

server 192.168.1.11:10900 max_fails=2 fail_timeout=40s weight=10;

server 192.168.1.20:10900 max_fails=2 fail_timeout=40s weight=10;

check_http_send "HEAD /interiorappapi/actuator/info HTTP/1.0\r\n\r\n";
check interval=3000 rise=2 fall=5 timeout=1000 type=http;
}