2.5.1. 常用¶
基本使用-一个Agent的开发模式¶
# Agent的开发模式:
[root@local13 ~]# ./consul agent -dev
==> Starting Consul agent...
==> Consul agent running!
# 查看集群成员:
[root@local13 ~]# ./consul members
Node Address Status Type Build Protocol DC Segment
local13 127.0.0.1:8301 alive server 1.2.2 2 dc1 <all>
# 使用 HTTP API 查看:
[root@local13 ~]# curl localhost:8500/v1/catalog/nodes
[
{
"ID": "796b14fe-1332-4aa0-d96f-8f287a4ccc7e",
"Node": "local13",
"Address": "127.0.0.1",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"wan": "127.0.0.1"
},
"Meta": {
"consul-network-segment": ""
},
"CreateIndex": 9,
"ModifyIndex": 10
}
]
# 还可以使用 DNS 接口来查询节点（默认端口：8600:
[root@local13 ~]# yum install bind-utils
[root@local13 ~]# dig @127.0.0.1 -p 8600 local13.node.consul
...
;; QUESTION SECTION:
;local13.node.consul. IN A
;; ANSWER SECTION:
local13.node.consul. 0 IN A 127.0.0.1
...
注册服务¶
定义一个服务:
[root@local13 ~]# mkdir /etc/consul.d
[root@local13 ~]# echo '{"service": {"name": "web", "tags": ["rails"], "port": 80}}' | sudo tee /etc/consul.d/web.json
[root@local13 ~]# ./consul agent -dev -config-dir=/etc/consul.d
# 使用 DNS API:
[root@local13 ~]# dig @127.0.0.1 -p 8600 web.service.consul
...
;; QUESTION SECTION:
;web.service.consul. IN A
;; ANSWER SECTION:
web.service.consul. 0 IN A 127.0.0.1
# 使用 DNS API 查找 SRV 记录:
[root@local13 ~]# dig @127.0.0.1 -p 8600 web.service.consul SRV
...
;; QUESTION SECTION:
;web.service.consul. IN SRV
;; ANSWER SECTION:
web.service.consul. 0 IN SRV 1 1 80 local13.node.dc1.consul.
;; ADDITIONAL SECTION:
local13.node.dc1.consul. 0 IN A 127.0.0.1
...
# 使用 HTTP API 查询:
[root@local13 ~]# curl http://localhost:8500/v1/catalog/service/web
# 健康检查
[root@local13 ~]# curl 'http://localhost:8500/v1/health/service/web?passing'
Consul集群¶
创建node1，consul server:
[root@local12 ~]# ./consul agent \
-server \
-bootstrap-expect=1 \
-data-dir=/tmp/consul \
-node=agent-one \
-bind=192.168.56.112 \
-enable-script-checks=true \
-config-dir=/etc/consul.d \
-client 0.0.0.0 \
-ui
# -node: 节点的名称
# -bind: 绑定的一个地址，用于节点之间通信的地址
# -server: 这个就是表示这个节点是个SERVER
# -bootstrap-expect: 这个就是表示期望提供的SERVER节点数目,数目一达到就会被激活,生成LEADER
# -dc: 指明数据中心的名字
# -client 0.0.0.0
# -ui: 启动UI（为了方便后续的UI访问）
创建node2,consul client:
[root@local13 ~]# ./consul agent -data-dir=/tmp/consul \
-node=agent-two \
-bind=192.168.56.113 -enable-script-checks=true \
-config-dir=/etc/consul.d \
-ui
加入集群:
[root@local13 ~]# ./consul join 192.168.56.112
Successfully joined cluster by contacting 1 nodes.
[root@local13 ~]# ./consul members
Node Address Status Type Build Protocol DC Segment
agent-one 192.168.1.13:8301 alive server 1.2.2 2 dc1 <all>
agent-two 192.168.1.12:8301 alive client 1.2.2 2 dc1 <default>
查询节点:
[root@local13 ~]# dig @127.0.0.1 -p 8600 agent-two.node.consul
...
;; QUESTION SECTION:
;agent-two.node.consul. IN A
;; ANSWER SECTION:
agent-two.node.consul. 0 IN A 192.168.1.12
KV数据¶
基本操作:
consul kv put redis/config/minconns 1
consul kv put redis/config/minconns 2 # 更新
consul kv get redis/config/minconns
consul kv delete redis/config/minconns
consul kv delete -recurse redis # 批量删除