搭建consul¶

仅供参考

1 规划¶

IP	角色	系统
2.6	bootstrap	CentOS 6.8
2.3	server	windows xp
2.4	server	CentOS 6.6
2.5	client	CentOS 6.6
2.18	client	CentOS 6.8
2.19	client	CentOS 6.8
2.198	client	CentOS 6.8
2.199	client	CentOS 6.8

2 安装consul¶

所有机器执行以下命令

# mkdir -p /data/program/consul
# cd /data/program/consul
# ll consul*
-rw-r--r--+ 1 root root 6.2M 10月 27 11:38 consul_0.7.0_linux_amd64.zip
# unzip consul_0.7.0_linux_amd64.zip
# echo "export PATH=$PATH:/data/program/consul" >>/etc/profile
# source /etc/profile
# which consul
/data/program/consul/consul

参考: 官网安装

3 2.199安装consul-template¶

# cd /data/program/consul
# ls
consul  consul_0.7.0_linux_amd64.zip  consul-template_0.16.0_linux_amd64.zip
# unzip consul-template_0.16.0_linux_amd64.zip
# ll
总用量 42804
-rwxr-xr-x 1 root root 24003648 9月  15 00:16 consul
-rw-r--r-- 1 root root  6470848 10月 27 11:38 consul_0.7.0_linux_amd64.zip
-rwxr-xr-x 1 root root 10128479 9月  23 06:24 consul-template
-rw-r--r-- 1 root root  3219587 9月  23 06:27 consul-template_0.16.0_linux_amd64.zip

# cp consul-template /usr/bin
# which consul-template
/usr/bin/consul-template

4 每台机器配置¶

4.1 2.6¶

# mkdir -p /etc/consul.d/{bootstrap,server,client}

# cat /etc/consul.d/bootstrap/config.json
{
    "bootstrap": true,
    "server": true,
    "datacenter": "jiuge-01",
    "data_dir": "/data/program/consul/consul_data",
    "node_name": "bs2-6",
    "bind_addr": "192.168.2.6",
    "client_addr": "0.0.0.0",
    "ui": true,
    "log_level": "INFO",
    "enable_syslog": true,
    "retry_join": ["192.168.2.3","192.168.2.4"]
}

# vim /etc/init.d/consuld_bs
# chmod 755 /etc/init.d/consuld_bs

4.2 2.3¶

4.3 2.4¶

# mkdir -p /etc/consul.d/{bootstrap,server,client}

# cat /etc/consul.d/server/config.json
{
    "bootstrap": false,
    "server": true,
    "datacenter": "jiuge-01",
    "data_dir": "/data/program/consul/consul_data",
    "node_name": "s2-4",
    "bind_addr": "192.168.2.4",
    "client_addr": "0.0.0.0",
    "ui": true,
    "log_level": "INFO",
    "enable_syslog": true,
    "retry_join": ["192.168.2.6","192.168.2.3"]
}

# vim /etc/init.d/consuld_s
# chmod 755 /etc/init.d/consuld_s

4.4 2.5¶

2.5
# mkdir -p /etc/consul.d/{bootstrap,server,client}
# cat /etc/consul.d/client/config.json
{
    "server": false,
    "datacenter": "jiuge-01",
    "data_dir": "/data/program/consul/consul_data",
    "node_name": "c2-5",
    "bind_addr": "192.168.2.5",
    "log_level": "INFO",
    "enable_syslog": true,
    "start_join": ["192.168.2.6","192.168.2.3","192.168.2.4"],
    "retry_join": ["192.168.2.6","192.168.2.3","192.168.2.4"]
}

# vim /etc/init.d/consuld
# chmod 755 /etc/init.d/consuld

4.5 2.18¶

# mkdir -p /etc/consul.d/{bootstrap,server,client}

# cat /etc/consul.d/client/config.json
{
    "server": false,
    "datacenter": "jiuge-01",
    "data_dir": "/data/program/consul/consul_data",
    "node_name": "c2-18",
    "bind_addr": "192.168.2.18",
    "log_level": "INFO",
    "enable_syslog": true,
    "start_join": ["192.168.2.6","192.168.2.3","192.168.2.4"],
    "retry_join": ["192.168.2.6","192.168.2.3","192.168.2.4"]
}

# vim /etc/init.d/consuld
# chmod 755 /etc/init.d/consuld

4.6 2.19¶

# mkdir -p /etc/consul.d/{bootstrap,server,client}

# cat /etc/consul.d/client/config.json
{
    "server": false,
    "datacenter": "jiuge-01",
    "data_dir": "/data/program/consul/consul_data",
    "node_name": "c2-19",
    "bind_addr": "192.168.2.19",
    "client_addr": "0.0.0.0",
    "log_level": "INFO",
    "enable_syslog": true,
    "start_join": ["192.168.2.6","192.168.2.3","192.168.2.4"],
    "retry_join": ["192.168.2.6","192.168.2.3","192.168.2.4"]
}

# vim /etc/init.d/consuld
# chmod 755 /etc/init.d/consuld

4.7 2.198¶

# mkdir -p /etc/consul.d/{bootstrap,server,client}

# cat /etc/consul.d/client/config.json
{
    "server": false,
    "datacenter": "jiuge-01",
    "data_dir": "/data/program/consul/consul_data",
    "node_name": "c2-198",
    "bind_addr": "192.168.2.198",
    "log_level": "INFO",
    "enable_syslog": true,
    "start_join": ["192.168.2.6","192.168.2.3","192.168.2.4"],
    "retry_join": ["192.168.2.6","192.168.2.3","192.168.2.4"]
}

# vim /etc/init.d/consuld
# chmod 755 /etc/init.d/consuld

4.8 2.199¶

# mkdir -p /etc/consul.d/{bootstrap,server,client}

# cat /etc/consul.d/client/config.json
{
    "server": false,
    "datacenter": "jiuge-01",
    "data_dir": "/data/program/consul/consul_data",
    "node_name": "c2-199",
    "bind_addr": "192.168.2.199",
    "log_level": "INFO",
    "enable_syslog": true,
    "start_join": ["192.168.2.6","192.168.2.3","192.168.2.4"],
    "retry_join": ["192.168.2.6","192.168.2.3","192.168.2.4"]
}

# vim /etc/init.d/consuld
# chmod 755 /etc/init.d/consuld

参考

5 启动脚本¶

5.1 consul启动脚本¶

# cat /etc/init.d/consuld
#!/bin/bash
#
# consul        Manage the consul agent
#
# chkconfig:   2345 95 5
# description: Consul is a tool for service discovery and configuration
# processname: consul
# config: /etc/consul.conf
# pidfile: /var/run/consul.pid

### BEGIN INIT INFO
# Provides:       consul
# Required-Start: $local_fs $network
# Required-Stop:
# Should-Start:
# Should-Stop:
# Default-Start: 2 3 4 5
# Default-Stop:  0 1 6
# Short-Description: Manage the consul agent
# Description: Consul is a tool for service discovery and configuration
### END INIT INFO

# source function library
. /etc/rc.d/init.d/functions

prog="consul"
user="consul"
exec="/data/program/consul/$prog"
pidfile="/var/run/$prog.pid"
lockfile="/var/lock/subsys/$prog"
logfile="/var/log/$prog.log"
confdir="/etc/consul.d/client"

# pull in sysconfig settings


start() {
    [ -x $exec ] || exit 5

    [ -d $confdir ] || exit 6

    umask 077

    touch $logfile $pidfile

    echo -n $"Starting $prog: "

    ## holy shell shenanigans, batman!
    ## daemon can't be backgrounded.  we need the pid of the spawned process,
    ## which is actually done via runuser thanks to --user.  you can't do "cmd
    ## &; action" but you can do "{cmd &}; action".
    daemon \
        --pidfile=$pidfile \
        " { $exec agent -config-dir=$confdir &>> $logfile & } ; echo \$! >| $pidfile "

    RETVAL=$?
    echo

    [ $RETVAL -eq 0 ] && touch $lockfile

    return $RETVAL
}

stop() {
    echo -n $"Shutting down $prog: "
    ## graceful shutdown with SIGINT
    killproc -p $pidfile $exec -INT
    RETVAL=$?
    echo
    [ $RETVAL -eq 0 ] && rm -f $lockfile
    return $RETVAL
}

restart() {
    stop
    sleep 2
    start
}

reload() {
    echo -n $"Reloading $prog: "
    killproc -p $pidfile $exec -HUP
    echo
}

force_reload() {
    restart
}

rh_status() {
    status -p "$pidfile" -l $prog $exec
}

rh_status_q() {
    rh_status >/dev/null 2>&1
}

case "$1" in
    start)
        rh_status_q && exit 0
        $1
        ;;
    stop)
        rh_status_q || exit 0
        $1
        ;;
    restart)
        $1
        ;;
    reload)
        rh_status_q || exit 7
        $1
        ;;
    force-reload)
        force_reload
        ;;
    status)
        rh_status
        ;;
    condrestart|try-restart)
        rh_status_q || exit 0
        restart
        ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
        exit 2
esac

exit $?

参考

consul启动脚本github地址

5.2 consul-template脚本¶

# cat /etc/init.d/consul-templated
#!/bin/sh
#
# consul-template - this script manages the consul-template
#
# chkconfig:   345 97 03
# processname: consul-template

### BEGIN INIT INFO
# Provides:       consul-template
# Required-Start: $local_fs $network
# Required-Stop:  $local_fs $network
# Default-Start: 3 4 5
# Default-Stop:  0 1 2 6
# Short-Description: Manage the vault server
### END INIT INFO

# Source function library.
. /etc/rc.d/init.d/functions

if [ -L $0 ]; then
    initscript=`/bin/readlink -f $0`
else
    initscript=$0
fi


exec="/bin/consul-template"
prog=`/bin/basename $exec`
conffile="/etc/consul.d/consul_template/consul_template.conf"
lockfile="/var/lock/subsys/${prog}"
logfile="/var/log/${prog}.log"
pidfile="/var/run/${prog}.pid"

RETVAL=0

start() {
    [ -x $exec ] || exit 5
    [ -f $conffile ] || exit 6

    echo -n $"Starting $prog: "
    /bin/touch $logfile
    $exec -pid-file=$pidfile -config=$conffile &>> $logfile  &
    RETVAL=$?
    echo
    [ $RETVAL = 0 ] && touch ${lockfile}
    return $RETVAL
}


stop() {
    echo -n $"Stopping $prog: "
    killproc -p $pidfile $exec 2>>$logfile
    RETVAL=$?
    echo
    [ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}
    return $RETVAL
}

restart() {
    stop
    sleep 2
    start
}

reload() {
    echo -n $"Reloading $prog: "
    killproc -p $pidfile $exec -HUP
    RETVAL=$?
    echo
}

force_reload() {
    restart
}

configtest() {
    if [ "$#" -ne 0 ] ; then
        case "$1" in
            -q)
                FLAG=$1
                ;;
            *)
                ;;
        esac
        shift
    fi
    ${exec} -dry -config=${conffile}  $FLAG
    RETVAL=$?
    return $RETVAL
}

rh_status() {
    status $prog
}

rh_status_q() {
    rh_status >/dev/null 2>&1
}

# See how we were called.
case "$1" in
    start)
        rh_status >/dev/null 2>&1 && exit 0
        start
        ;;
    stop)
        stop
        ;;
    status)
        rh_status
        RETVAL=$?
        ;;
    restart)
        restart
        ;;
    reload)
        reload
        ;;
    configtest)
        configtest
        ;;
    *)
        echo $"Usage: $prog {start|stop|restart|reload|status|configtest}"
        RETVAL=2
esac

exit $RETVAL

consul-template配置案列¶

# tree /etc/consul.d/consul_template/
├── consul_template.conf
├── consul_template.conf.example
└── weixin-server.ctmpl

# cat /etc/consul.d/consul_template/weixin-server.ctmpl
upstream weixinHost {
  {{range service "weixin-server"}}
  server {{.Address}}:{{.Port}};
  {{end}}
}

server {
  listen 80;
  server_name test118;
  location /weixin  {
  proxy_pass http://weixinHost/weixin/server;
  }
  }

# cat /etc/consul.d/consul_template/consul_template.conf
reload_signal = "SIGHUP"
dump_signal = "SIGQUIT"
kill_signal = "SIGINT"
retry = "10s"
max_stale = "10m"
log_level = "debug"
pid_file = "/var/run/consul-template.pid"
wait = "5s:10s"
template {
  source = "/etc/consul.d/consul_template/weixin-server.ctmpl"
  destination = "/etc/nginx/conf.d/weixin.conf"
  command = "service nginx reload || true"
  perms = 0644
  backup = true
  left_delimiter  = "{{"
  right_delimiter = "}}"

  wait = "2s:6s"
}

参考

6 consul使用¶

#查看集群节点详细情况
# consul members

#离开集群
# consul leave

#强制离开集群
# consul force-leave c27

#通过api查看节点详细情况
# curl http://192.168.11.46:8500/v1/catalog/nodes\?pretty

#通过api删除节点
# curl -X PUT http://192.168.11.46:8500/v1/agent/force-leave/c27