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1.问题描述

刚搭建使用以下命令下载并安装的consul服务。

wget https://releases.hashicorp.com/consul/1.4.4/consul_1.4.4_linux_amd64.zip

unzip consul_1.4.4_linux_amd64.zip

sudo mv consul /usr/local/bin/

可见consul的安装十分简单，但以下基本操作均出现问题：

1） 绑定节点

consul agent -dev -bind=192.168.108.119

Error starting agent: Failed to start Consul server: Failed to start RPC layer: listen tcp 192.168.108.119:8300: bind: cannot assign requested address

2）向集群中增加节点

consul join 192.168.108.119 192.168.108.19

Error joining address ‘192.168.108.19’: Put http://127.0.0.1:8500/v1/agent/join/192.168.108.19: dial tcp 127.0.0.1:8500: connect: connection refused

Error joining address ‘192.168.108.19’: Put http://127.0.0.1:8500/v1/agent/join/192.168.108.19: dial tcp 127.0.0.1:8500: connect: connection refused

Failed to join any nodes.

3）查询集群中成员

consul members

Error retrieving members: Get http://127.0.0.1:8500/v1/agent/members?segment=_all: dial tcp 127.0.0.1:8500: connect: connection refused

2.问题分析

同时报以上几个错误，表明应该是某个关键性的配置出现问题。

从官网上获得提示，应该是端口问题，经过测试发现8300,8500,8600等端口均处于关闭状态

3.解决办法

经过分析发现是没有成功配置节点，按以下方式成功配置节点即可：

1）将当前节点设为server类型的节点，同时默认为leader

consul agent -server -bootstrap -ui-dir /etc/consul_ui -data-dir /tmp/consul -node master1

2) 将当前节点设置为server类型的节点

consul agent -server -data-dir /tmp/consul -node master2

consul agent -server -data-dir /tmp/consul -node master3

3）将其他节点手动加入到集群当中

 consul join 192.168.108.117 192.168.108.19

4)查看集群情况

consul members

至此一个consul集群才算真正搭建起来了。

4.知识拓展

1）通过配置文件的方式来进行节点配置

#新建一个文件夹用来存放配置文件

sudo mkdir /etc/consul.d

2)新建配置文件

sudo vim /ect/consul.d/basic_config.json

{
  "datacenter": "pcl-aws1",
  "data_dir": "/tmp/consul",
  "log_level": "INFO",
  "node_name": "master1",
  "server": true,
  "bind_addr":"192.168.108.119","192.168.108.19","192.168.108.117",
  "addresses": {
    "https": "0.0.0.0"
  },
  "ports": {
    "https": 8080
  },
  "key_file": "/etc/pki/tls/private/my.key",
  "cert_file": "/etc/pki/tls/certs/my.crt",
  "ca_file": "/etc/pki/tls/certs/ca-bundle.crt"
}

3)指定配置文件启动

consul agent -dev -bind=192.168.108.117 -config-dir /etc/consul.d/

4）允许其他主机访问