Consul入门
2017-11-06 08:46
134 查看
参考文档：
https://www.consul.io/intro/index.html
备注： 采用版本Consul v1.0.0
目录
consul介绍
consul安装
运行代理
关闭代理
注册服务
consul集群
健康检查
KV数据
WebUI
gossip协议
一致性协议： https://www.consul.io/docs/internals/consensus.html
一、consul介绍
服务发现
健康检查
KV存储
多数据中心
二、安装
windows系统：
1、下载安装包
https://www.consul.io/downloads.html
2、配置路径
解压zip
执行文件拷贝到C:\\consul\\bin
配置环境变量：path C:\TDM-GCC-64\bin;C:\consul\bin;C:\Gradle\gradle-3.5\bin;%JAVA_HOME%\bin;%HADOOP_HOME%\bin;%M2_HOME%\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files
(x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\Intel\WiFi\bin\;C:\ProgramData\Oracle\Java\javapath;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\ProgramData\Anaconda3;C:\ProgramData\Anaconda3\Scripts;C:\ProgramData\Anaconda3\Library\bin;C:\TDM-GCC-64\bin;C:\Program
Files\Git\cmd;%GROOVY_HOME%\bin
3、测试安装
C:\Windows\system32>consul --version
Consul v0.8.1
Protocol 2 spoken by default, understands 2 to 3 (agent will automatically use protocol >2 when speaking to compatible agents)
ubuntu系统：
consul直接拷贝到： /usr/local/bin
三、运行代理
启动一个代理
C:\Windows\system32>consul agent -dev
==> Starting Consul agent...
==> Consul agent running!
Version: 'v0.8.1'
Node ID: '6edb8e08-d606-4650-a196-fff5632843f9'
Node name: 'DESKTOP-QHG7SFL'
Datacenter: 'dc1'
Server: true (bootstrap: false)
Client Addr: 127.0.0.1 (HTTP: 8500, HTTPS: -1, DNS: 8600)
Cluster Addr: 127.0.0.1 (LAN: 8301, WAN: 8302)
Gossip encrypt: false, RPC-TLS: false, TLS-Incoming: false
Atlas: <disabled>
==> Log data will now stream in as it occurs:
2017/11/06 09:06:38 [DEBUG] Using unique ID "6edb8e08-d606-4650-a196-fff5632843f9" from host as node ID
查看集群成员
新打卡一个窗口
查看成员信息
C:\Windows\system32>consul members
Node Address Status Type Build Protocol DC
DESKTOP-QHG7SFL 127.0.0.1:8301 alive server 0.8.1 2 dc1
C:\Windows\system32>curl localhost:8500/v1/catalog/nodes
[
{
"ID": "6edb8e08-d606-4650-a196-fff5632843f9",
"Node": "DESKTOP-QHG7SFL",
"Address": "127.0.0.1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"wan": "127.0.0.1"
},
"Meta": {},
"CreateIndex": 5,
"ModifyIndex": 6
}
]
四、关闭代理
强制关闭： ctrl - c
一致性： 不要强制性关闭
五、注册服务
1、服务定义的方式注册服务
创建配置文件
$ sudo mkdir /etc/consul.d
$echo '{"service": {"name": "web", "tags": ["rails"], "port": 80}}' > | sudo tee /etc/consul.d/web.json
重启代理
$ consul agent -dev -config-dir=/etc/consul.d
==> Starting Consul agent...
==> Consul agent running!
Version: 'v1.0.0'
Node ID: 'b1a78817-513c-1dbd-cf57-d3602f503764'
Node name: 'slave-01'
Datacenter: 'dc1' (Segment: '<all>')
Server: true (Bootstrap: false)
Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, DNS: 860
2、DNS访问服务
$ dig @127.0.0.1 -p 8600 web.service.consul
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 -p 8600 web.service.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56299
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;web.service.consul. IN A
;; ANSWER SECTION:
web.service.consul. 0 IN A 127.0.0.1
;; Query time: 0 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Tue Nov 07 05:53:38 CST 2017
;; MSG SIZE rcvd: 63
use the DNS API to retrieve the entire address/port pair as a SRV record:
$ dig @127.0.0.1 -p 8600 web.service.consul SRV
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 -p 8600 web.service.consul SRV
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62764
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 3
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;web.service.consul. IN SRV
;; ANSWER SECTION:
web.service.consul. 0 IN SRV 1 1 80 slave-01.node.dc1.consul.
;; ADDITIONAL SECTION:
slave-01.node.dc1.consul. 0 IN A 127.0.0.1
slave-01.node.dc1.consul. 0 IN TXT "consul-network-segment="
;; Query time: 0 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Tue Nov 07 05:55:21 CST 2017
;; MSG SIZE rcvd: 143
3、Http访问服务
$ curl http://localhost:8500/v1/catalog/service/web
[
{
"ID": "b1a78817-513c-1dbd-cf57-d3602f503764",
"Node": "slave-01",
"Address": "127.0.0.1",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"wan": "127.0.0.1"
},
"NodeMeta": {
"consul-network-segment": ""
},
"ServiceID": "web",
"ServiceName": "web",
"ServiceTags": [
"rails"
],
"ServiceAddress": "",
"ServicePort": 80,
"ServiceEnableTagOverride": false,
"CreateIndex": 6,
"ModifyIndex": 6
}
]
只访问健康实例：
$ curl 'http://localhost:8500/v1/health/service/web?passing'
[
{
"Node": {
"ID": "b1a78817-513c-1dbd-cf57-d3602f503764",
"Node": "slave-01",
"Address": "127.0.0.1",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"wan": "127.0.0.1"
},
"Meta": {
"consul-network-segment": ""
},
"CreateIndex": 5,
"ModifyIndex": 6
},
"Service": {
"ID": "web",
"Service": "web",
"Tags": [
"rails"
],
"Address": "",
"Port": 80,
"EnableTagOverride": false,
"CreateIndex": 6,
"ModifyIndex": 6
},
"Checks": [
{
"Node": "slave-01",
"CheckID": "serfHealth",
"Name": "Serf Health Status",
"Status": "passing",
"Notes": "",
"Output": "Agent alive and reachable",
"ServiceID": "",
"ServiceName": "",
"ServiceTags": [],
"CreateIndex": 5,
"ModifyIndex": 5
}
]
}
]
4、更新服务
1> consul可以在服务提供的时候动态修改状态
2> 更新服务方法
修改配置文件，并发送SIGHUP给代理
HTTP API
六、Consul集群
1、启动server
注意： -ui参数 打开web ui
$ consul agent -server -bootstrap-expect=1 -data-dir=/tmp/consul -node=agent-one -bind=192.168.1.190 -ui -enable-script-checks=true -config-dir=/etc/consul.d
BootstrapExpect is set to 1; this is the same as Bootstrap mode.
bootstrap = true: do not enable unless necessary
==> Starting Consul agent...
==> Consul agent running!
Version: 'v1.0.0'
Node ID: '51006970-7f03-de36-12fb-dcd7dd0ecdee'
Node name: 'agent-one'
Datacenter: 'dc1' (Segment: '<all>')
Server: true (Bootstrap: true)
Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, DNS: 8600)
Cluster Addr: 192.168.1.190 (LAN: 8301, WAN: 8302)
Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false
--node name： 节点名称
-bootstrap-expect: 期望服务数码
--data-dir: 节点存储数据的目录
-enable-script-checks：健康检查
-config-dir: 配置文件所在目录
2、启动代理
$ consul agent -data-dir=/tmp/consul -node=agent-two -bind=192.168.1.191 -enable-script-checks=true -config-dir=/etc/consul.d
==> Starting Consul agent...
==> Consul agent running!
Version: 'v1.0.0'
Node ID: 'bdf166e5-9ffd-4f0f-d513-9010b2d318d8'
Node name: 'agent-two'
Datacenter: 'dc1' (Segment: '')
Server: false (Bootstrap: false)
Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, DNS: 8600)
Cluster Addr: 192.168.1.191 (LAN: 8301, WAN: 8302)
Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false
3、加入集群
lxq@slave-01:/data$ consul join 192.168.1.191
Successfully joined cluster by contacting 1 nodes.
lxq@slave-01:/data$ consul members
Node Address Status Type Build Protocol DC Segment
agent-one 192.168.1.190:8301 alive server 1.0.0 2 dc1 <all>
agent-two 192.168.1.191:8301 alive client 1.0.0 2 dc1 <default>
注： consul代理加入集群，只需加入一个存在的成员就可以了。
4、自动加入集群
add the
the
object to your Consul configuration file
5、访问节点
lxq@slave-01:/data$ dig @127.0.0.1 -p 8600 agent-two.node.consul
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 -p 8600 agent-two.node.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27975
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;agent-two.node.consul. IN A
;; ANSWER SECTION:
agent-two.node.consul. 0 IN A 192.168.1.191
;; Query time: 0 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Tue Nov 07 07:57:56 CST 2017
;; MSG SIZE rcvd: 66
6、离开集群
1> 强制离开 Ctrl-C
2> 优雅离开
运行节点转为离开状态
七、健康检查——需要研究下，与教程结果不符
1、定义检查
30s运行一次ping操作，检查google网站的健康：
root@slave-02:/home/lxq# echo '{"check": {"name": "ping",
> "script": "ping -c1 google.com >/dev/null", "interval": "30s"}}' \
> >/etc/consul.d/ping.json
root@slave-02:/home/lxq# echo '{"service": {"name": "web", "tags": ["rails"], "port": 80,
> "check": {"script": "curl localhost >/dev/null 2>&1", "interval": "10s"}}}' \
> >/etc/consul.d/web.json
10s运行一次检查本地webserver的健康：
root@slave-02:/home/lxq# cat /etc/consul.d/
ping.json web.json
root@slave-02:/home/lxq# cat /etc/consul.d/web.json
{"service": {"name": "web", "tags": ["rails"], "port": 80,
"check": {"script": "curl localhost >/dev/null 2>&1", "interval": "10s"}}}
2、检查健康状态
root@slave-02:/home/lxq# curl http://localhost:8500/v1/health/state/critical
[]
root@slave-02:/home/lxq# dig @127.0.0.1 -p 8600 web.service.consul
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 -p 8600 web.service.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8183
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;web.service.consul. IN A
;; ANSWER SECTION:
web.service.consul. 0 IN A 192.168.1.191
web.service.consul. 0 IN A 192.168.1.190
;; Query time: 1 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Tue Nov 07 08:20:45 CST 2017
;; MSG SIZE rcvd: 79
八、KV Data
用处： 动态配置，帮助协调服务，领导选取
方式： Consul kv cli, Consul KV HTTP API
1、写入
root@slave-02:/home/lxq# consul kv get redis/config/minconns
Error! No key exists at: redis/config/minconns
root@slave-02:/home/lxq# consul kv put redis/config/minconns 1
Success! Data written to: redis/config/minconns
root@slave-02:/home/lxq# consul kv put redis/config/maxconns 25
Success! Data written to: redis/config/maxconns
root@slave-02:/home/lxq# consul kv put -flags=42 redis/config/users/admin abcd1234
Success! Data written to: redis/config/users/admin
2、读取
读取一个键值对：
root@slave-02:/home/lxq# consul kv get redis/config/minconns
1
root@slave-02:/home/lxq# consul kv get -detailed redis/config/minconns
CreateIndex 560
Flags 0
Key redis/config/minconns
LockIndex 0
ModifyIndex 560
Session -
Value 1
读取所有的键值对：
root@slave-02:/home/lxq# consul kv get -recurse
redis/config/maxconns:25
redis/config/minconns:1
redis/config/users/admin:abcd1234
3、删除
删除一个键
root@slave-02:/home/lxq# consul kv delete redis/config/minconns
Success! Deleted key: redis/config/minconns
删除所有redis开头的键
root@slave-02:/home/lxq# consul kv delete -recurse redis
Success! Deleted keys with prefix: redis
4、cas设置——与教程不一致
root@slave-02:/home/lxq# consul kv put foo bar
Success! Data written to: foo
root@slave-02:/home/lxq# consul kv get foo
bar
root@slave-02:/home/lxq# consul kv put foo zip
Success! Data written to: foo
root@slave-02:/home/lxq# consul kv get foo
zip
root@slave-02:/home/lxq# consul kv put -cas -modify-index=123 foo bar
Error! Did not write to foo: CAS failed
root@slave-02:/home/lxq# consul kv put -cas -modify-index=123 foo bar
Error! Did not write to foo: CAS failed
九、Web UI
consul agent -ui
http://localhost:8500/ui
https://www.consul.io/intro/index.html
备注： 采用版本Consul v1.0.0
目录
consul介绍
consul安装
运行代理
关闭代理
注册服务
consul集群
健康检查
KV数据
WebUI
gossip协议
一致性协议： https://www.consul.io/docs/internals/consensus.html
一、consul介绍
服务发现
健康检查
KV存储
多数据中心
二、安装
windows系统：
1、下载安装包
https://www.consul.io/downloads.html
2、配置路径
解压zip
执行文件拷贝到C:\\consul\\bin
配置环境变量：path C:\TDM-GCC-64\bin;C:\consul\bin;C:\Gradle\gradle-3.5\bin;%JAVA_HOME%\bin;%HADOOP_HOME%\bin;%M2_HOME%\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files
(x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\Intel\WiFi\bin\;C:\ProgramData\Oracle\Java\javapath;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\ProgramData\Anaconda3;C:\ProgramData\Anaconda3\Scripts;C:\ProgramData\Anaconda3\Library\bin;C:\TDM-GCC-64\bin;C:\Program
Files\Git\cmd;%GROOVY_HOME%\bin
3、测试安装
C:\Windows\system32>consul --version
Consul v0.8.1
Protocol 2 spoken by default, understands 2 to 3 (agent will automatically use protocol >2 when speaking to compatible agents)
ubuntu系统：
consul直接拷贝到： /usr/local/bin
三、运行代理
启动一个代理
C:\Windows\system32>consul agent -dev
==> Starting Consul agent...
==> Consul agent running!
Version: 'v0.8.1'
Node ID: '6edb8e08-d606-4650-a196-fff5632843f9'
Node name: 'DESKTOP-QHG7SFL'
Datacenter: 'dc1'
Server: true (bootstrap: false)
Client Addr: 127.0.0.1 (HTTP: 8500, HTTPS: -1, DNS: 8600)
Cluster Addr: 127.0.0.1 (LAN: 8301, WAN: 8302)
Gossip encrypt: false, RPC-TLS: false, TLS-Incoming: false
Atlas: <disabled>
==> Log data will now stream in as it occurs:
2017/11/06 09:06:38 [DEBUG] Using unique ID "6edb8e08-d606-4650-a196-fff5632843f9" from host as node ID
查看集群成员
新打卡一个窗口
查看成员信息
C:\Windows\system32>consul members
Node Address Status Type Build Protocol DC
DESKTOP-QHG7SFL 127.0.0.1:8301 alive server 0.8.1 2 dc1
C:\Windows\system32>curl localhost:8500/v1/catalog/nodes
[
{
"ID": "6edb8e08-d606-4650-a196-fff5632843f9",
"Node": "DESKTOP-QHG7SFL",
"Address": "127.0.0.1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"wan": "127.0.0.1"
},
"Meta": {},
"CreateIndex": 5,
"ModifyIndex": 6
}
]
四、关闭代理
强制关闭： ctrl - c
一致性： 不要强制性关闭
五、注册服务
1、服务定义的方式注册服务
创建配置文件
$ sudo mkdir /etc/consul.d
$echo '{"service": {"name": "web", "tags": ["rails"], "port": 80}}' > | sudo tee /etc/consul.d/web.json
重启代理
$ consul agent -dev -config-dir=/etc/consul.d
==> Starting Consul agent...
==> Consul agent running!
Version: 'v1.0.0'
Node ID: 'b1a78817-513c-1dbd-cf57-d3602f503764'
Node name: 'slave-01'
Datacenter: 'dc1' (Segment: '<all>')
Server: true (Bootstrap: false)
Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, DNS: 860
2、DNS访问服务
$ dig @127.0.0.1 -p 8600 web.service.consul
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 -p 8600 web.service.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56299
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;web.service.consul. IN A
;; ANSWER SECTION:
web.service.consul. 0 IN A 127.0.0.1
;; Query time: 0 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Tue Nov 07 05:53:38 CST 2017
;; MSG SIZE rcvd: 63
use the DNS API to retrieve the entire address/port pair as a SRV record:
$ dig @127.0.0.1 -p 8600 web.service.consul SRV
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 -p 8600 web.service.consul SRV
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62764
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 3
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;web.service.consul. IN SRV
;; ANSWER SECTION:
web.service.consul. 0 IN SRV 1 1 80 slave-01.node.dc1.consul.
;; ADDITIONAL SECTION:
slave-01.node.dc1.consul. 0 IN A 127.0.0.1
slave-01.node.dc1.consul. 0 IN TXT "consul-network-segment="
;; Query time: 0 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Tue Nov 07 05:55:21 CST 2017
;; MSG SIZE rcvd: 143
3、Http访问服务
$ curl http://localhost:8500/v1/catalog/service/web
[
{
"ID": "b1a78817-513c-1dbd-cf57-d3602f503764",
"Node": "slave-01",
"Address": "127.0.0.1",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"wan": "127.0.0.1"
},
"NodeMeta": {
"consul-network-segment": ""
},
"ServiceID": "web",
"ServiceName": "web",
"ServiceTags": [
"rails"
],
"ServiceAddress": "",
"ServicePort": 80,
"ServiceEnableTagOverride": false,
"CreateIndex": 6,
"ModifyIndex": 6
}
]
只访问健康实例：
$ curl 'http://localhost:8500/v1/health/service/web?passing'
[
{
"Node": {
"ID": "b1a78817-513c-1dbd-cf57-d3602f503764",
"Node": "slave-01",
"Address": "127.0.0.1",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"wan": "127.0.0.1"
},
"Meta": {
"consul-network-segment": ""
},
"CreateIndex": 5,
"ModifyIndex": 6
},
"Service": {
"ID": "web",
"Service": "web",
"Tags": [
"rails"
],
"Address": "",
"Port": 80,
"EnableTagOverride": false,
"CreateIndex": 6,
"ModifyIndex": 6
},
"Checks": [
{
"Node": "slave-01",
"CheckID": "serfHealth",
"Name": "Serf Health Status",
"Status": "passing",
"Notes": "",
"Output": "Agent alive and reachable",
"ServiceID": "",
"ServiceName": "",
"ServiceTags": [],
"CreateIndex": 5,
"ModifyIndex": 5
}
]
}
]
4、更新服务
1> consul可以在服务提供的时候动态修改状态
2> 更新服务方法
修改配置文件，并发送SIGHUP给代理
HTTP API
六、Consul集群
1、启动server
注意： -ui参数 打开web ui
$ consul agent -server -bootstrap-expect=1 -data-dir=/tmp/consul -node=agent-one -bind=192.168.1.190 -ui -enable-script-checks=true -config-dir=/etc/consul.d
BootstrapExpect is set to 1; this is the same as Bootstrap mode.
bootstrap = true: do not enable unless necessary
==> Starting Consul agent...
==> Consul agent running!
Version: 'v1.0.0'
Node ID: '51006970-7f03-de36-12fb-dcd7dd0ecdee'
Node name: 'agent-one'
Datacenter: 'dc1' (Segment: '<all>')
Server: true (Bootstrap: true)
Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, DNS: 8600)
Cluster Addr: 192.168.1.190 (LAN: 8301, WAN: 8302)
Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false
--node name： 节点名称
-bootstrap-expect: 期望服务数码
--data-dir: 节点存储数据的目录
-enable-script-checks：健康检查
-config-dir: 配置文件所在目录
2、启动代理
$ consul agent -data-dir=/tmp/consul -node=agent-two -bind=192.168.1.191 -enable-script-checks=true -config-dir=/etc/consul.d
==> Starting Consul agent...
==> Consul agent running!
Version: 'v1.0.0'
Node ID: 'bdf166e5-9ffd-4f0f-d513-9010b2d318d8'
Node name: 'agent-two'
Datacenter: 'dc1' (Segment: '')
Server: false (Bootstrap: false)
Client Addr: [127.0.0.1] (HTTP: 8500, HTTPS: -1, DNS: 8600)
Cluster Addr: 192.168.1.191 (LAN: 8301, WAN: 8302)
Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false
3、加入集群
lxq@slave-01:/data$ consul join 192.168.1.191
Successfully joined cluster by contacting 1 nodes.
lxq@slave-01:/data$ consul members
Node Address Status Type Build Protocol DC Segment
agent-one 192.168.1.190:8301 alive server 1.0.0 2 dc1 <all>
agent-two 192.168.1.191:8301 alive client 1.0.0 2 dc1 <default>
注： consul代理加入集群，只需加入一个存在的成员就可以了。
4、自动加入集群
add the
retry_join_ec2,
retry_join_gceor
the
retry_join_azurenested
object to your Consul configuration file
5、访问节点
lxq@slave-01:/data$ dig @127.0.0.1 -p 8600 agent-two.node.consul
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 -p 8600 agent-two.node.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27975
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;agent-two.node.consul. IN A
;; ANSWER SECTION:
agent-two.node.consul. 0 IN A 192.168.1.191
;; Query time: 0 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Tue Nov 07 07:57:56 CST 2017
;; MSG SIZE rcvd: 66
6、离开集群
1> 强制离开 Ctrl-C
2> 优雅离开
运行节点转为离开状态
七、健康检查——需要研究下，与教程结果不符
1、定义检查
30s运行一次ping操作，检查google网站的健康：
root@slave-02:/home/lxq# echo '{"check": {"name": "ping",
> "script": "ping -c1 google.com >/dev/null", "interval": "30s"}}' \
> >/etc/consul.d/ping.json
root@slave-02:/home/lxq# echo '{"service": {"name": "web", "tags": ["rails"], "port": 80,
> "check": {"script": "curl localhost >/dev/null 2>&1", "interval": "10s"}}}' \
> >/etc/consul.d/web.json
10s运行一次检查本地webserver的健康：
root@slave-02:/home/lxq# cat /etc/consul.d/
ping.json web.json
root@slave-02:/home/lxq# cat /etc/consul.d/web.json
{"service": {"name": "web", "tags": ["rails"], "port": 80,
"check": {"script": "curl localhost >/dev/null 2>&1", "interval": "10s"}}}
2、检查健康状态
root@slave-02:/home/lxq# curl http://localhost:8500/v1/health/state/critical
[]
root@slave-02:/home/lxq# dig @127.0.0.1 -p 8600 web.service.consul
; <<>> DiG 9.10.3-P4-Ubuntu <<>> @127.0.0.1 -p 8600 web.service.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8183
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;web.service.consul. IN A
;; ANSWER SECTION:
web.service.consul. 0 IN A 192.168.1.191
web.service.consul. 0 IN A 192.168.1.190
;; Query time: 1 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Tue Nov 07 08:20:45 CST 2017
;; MSG SIZE rcvd: 79
八、KV Data
用处： 动态配置，帮助协调服务，领导选取
方式： Consul kv cli, Consul KV HTTP API
1、写入
root@slave-02:/home/lxq# consul kv get redis/config/minconns
Error! No key exists at: redis/config/minconns
root@slave-02:/home/lxq# consul kv put redis/config/minconns 1
Success! Data written to: redis/config/minconns
root@slave-02:/home/lxq# consul kv put redis/config/maxconns 25
Success! Data written to: redis/config/maxconns
root@slave-02:/home/lxq# consul kv put -flags=42 redis/config/users/admin abcd1234
Success! Data written to: redis/config/users/admin
2、读取
读取一个键值对：
root@slave-02:/home/lxq# consul kv get redis/config/minconns
1
root@slave-02:/home/lxq# consul kv get -detailed redis/config/minconns
CreateIndex 560
Flags 0
Key redis/config/minconns
LockIndex 0
ModifyIndex 560
Session -
Value 1
读取所有的键值对：
root@slave-02:/home/lxq# consul kv get -recurse
redis/config/maxconns:25
redis/config/minconns:1
redis/config/users/admin:abcd1234
3、删除
删除一个键
root@slave-02:/home/lxq# consul kv delete redis/config/minconns
Success! Deleted key: redis/config/minconns
删除所有redis开头的键
root@slave-02:/home/lxq# consul kv delete -recurse redis
Success! Deleted keys with prefix: redis
4、cas设置——与教程不一致
root@slave-02:/home/lxq# consul kv put foo bar
Success! Data written to: foo
root@slave-02:/home/lxq# consul kv get foo
bar
root@slave-02:/home/lxq# consul kv put foo zip
Success! Data written to: foo
root@slave-02:/home/lxq# consul kv get foo
zip
root@slave-02:/home/lxq# consul kv put -cas -modify-index=123 foo bar
Error! Did not write to foo: CAS failed
root@slave-02:/home/lxq# consul kv put -cas -modify-index=123 foo bar
Error! Did not write to foo: CAS failed
九、Web UI
consul agent -ui
http://localhost:8500/ui
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