Consul初体验
Preface
Today I'm gonna implement a consul in my environment to discover service of MySQL database and check whether the master-slave is working normally.
Introduce
Consul is a tool like zookeeper which can discover services we've registered on it.It's just a simple binary command which can run with simple configuration file(json format).
official website:
Framework
| Hostname | IP | Port | OS Version | MySQL Version | MySQL Role | Consul Version | Consul Role |
| zlm1 | 192.168.56.100 | 3306 | CentOS 7.0 | 5.7.21 | master | Consul v1.2.2 | server |
| zlm2 | 192.168.56.101 | 3306 | CentOS 7.0 | 5.7.21 | slave | Consul v1.2.2 | client |
Procedure
Download and install consul.
[root@zlm1 :: /vagrant]
#wget https://releases.hashicorp.com/consul/1.2.2/consul_1.2.2_linux_amd64.zip
---- ::-- https://releases.hashicorp.com/consul/1.2.2/consul_1.2.2_linux_amd64.zip
Resolving releases.hashicorp.com (releases.hashicorp.com)... 151.101.229.183, 2a04:4e42:::
Connecting to releases.hashicorp.com (releases.hashicorp.com)|151.101.229.183|:... connected.
HTTP request sent, awaiting response... OK
Length: (18M) [application/zip]
Saving to: ‘consul_1..2_linux_amd64.zip’ %[===========================================================================================================>] ,, .8KB/s in 6m 12s -- :: (48.3 KB/s) - ‘consul_1..2_linux_amd64.zip’ saved [/] [root@zlm1 :: /vagrant/consul_1..2_linux_amd64]
#ls -l
total
-rwxrwxrwx vagrant vagrant Jul : consul //There's only a binary command in the unziped directory of zip file. [root@zlm1 :: /vagrant/consul_1..2_linux_amd64]
#mkdir /etc/consul.d [root@zlm1 :: /vagrant/consul_1..2_linux_amd64]
#mkdir /data/consul [root@zlm1 :: /vagrant/consul_1..2_linux_amd64]
#cp consul ~ [root@zlm1 :: ~]
#cd /usr/local/bin [root@zlm1 :: /usr/local/bin]
#ls -l|grep consul
lrwxrwxrwx root root Aug : consul -> /root/consul [root@zlm1 :: /usr/local/bin]
#consul --help
Usage: consul [--version] [--help] <command> [<args>] Available commands are:
agent Runs a Consul agent
catalog Interact with the catalog
connect Interact with Consul Connect
event Fire a new event
exec Executes a command on Consul nodes
force-leave Forces a member of the cluster to enter the "left" state
info Provides debugging information for operators.
intention Interact with Connect service intentions
join Tell Consul agent to join cluster
keygen Generates a new encryption key
keyring Manages gossip layer encryption keys
kv Interact with the key-value store
leave Gracefully leaves the Consul cluster and shuts down
lock Execute a command holding a lock
maint Controls node or service maintenance mode
members Lists the members of a Consul cluster
monitor Stream logs from a Consul agent
operator Provides cluster-level tools for Consul operators
reload Triggers the agent to reload configuration files
rtt Estimates network round trip time between nodes
snapshot Saves, restores and inspects snapshots of Consul server state
validate Validate config files/directories
version Prints the Consul version
watch Watch for changes in Consul
Start agent of consul by "dev" mode.
[root@zlm1 :: /usr/local/bin]
#consul agent -dev
==> Starting Consul agent...
==> Consul agent running!
Version: 'v1.2.2'
Node ID: '7c839914-8a47-ab36-8920-1a9da54fc6c3'
Node name: 'zlm1'
Datacenter: 'dc1' (Segment: '<all>')
Server: true (Bootstrap: false)
Client Addr: [127.0.0.1] (HTTP: , HTTPS: -, DNS: )
Cluster Addr: 127.0.0.1 (LAN: , WAN: )
Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false ==> Log data will now stream in as it occurs: // :: [DEBUG] agent: Using random ID "7c839914-8a47-ab36-8920-1a9da54fc6c3" as node ID
// :: [INFO] raft: Initial configuration (index=): [{Suffrage:Voter ID:7c839914-8a47-ab36--1a9da54fc6c3 Address:127.0.0.1:}]
// :: [INFO] serf: EventMemberJoin: zlm1.dc1 127.0.0.1
// :: [INFO] serf: EventMemberJoin: zlm1 127.0.0.1
// :: [INFO] raft: Node at 127.0.0.1: [Follower] entering Follower state (Leader: "")
// :: [INFO] consul: Adding LAN server zlm1 (Addr: tcp/127.0.0.1:) (DC: dc1)
// :: [INFO] consul: Handled member-join event for server "zlm1.dc1" in area "wan"
// :: [DEBUG] agent/proxy: managed Connect proxy manager started
// :: [WARN] agent/proxy: running as root, will not start managed proxies
// :: [INFO] agent: Started DNS server 127.0.0.1: (tcp)
// :: [INFO] agent: Started DNS server 127.0.0.1: (udp)
// :: [INFO] agent: Started HTTP server on 127.0.0.1: (tcp)
// :: [INFO] agent: started state syncer
// :: [WARN] raft: Heartbeat timeout from "" reached, starting election
// :: [INFO] raft: Node at 127.0.0.1: [Candidate] entering Candidate state in term
// :: [DEBUG] raft: Votes needed:
// :: [DEBUG] raft: Vote granted from 7c839914-8a47-ab36--1a9da54fc6c3 in term . Tally:
// :: [INFO] raft: Election won. Tally:
// :: [INFO] raft: Node at 127.0.0.1: [Leader] entering Leader state
// :: [INFO] consul: cluster leadership acquired
// :: [INFO] consul: New leader elected: zlm1
// :: [INFO] connect: initialized CA with provider "consul"
// :: [DEBUG] consul: Skipping self join check for "zlm1" since the cluster is too small
// :: [INFO] consul: member 'zlm1' joined, marking health alive
// :: [DEBUG] agent: Skipping remote check "serfHealth" since it is managed automatically
// :: [INFO] agent: Synced node info
// :: [DEBUG] agent: Skipping remote check "serfHealth" since it is managed automatically
// :: [DEBUG] agent: Node info in sync
// :: [DEBUG] agent: Node info in sync
// :: [DEBUG] consul: Skipping self join check for "zlm1" since the cluster is too small
// :: [DEBUG] agent: Skipping remote check "serfHealth" since it is managed automatically
// :: [DEBUG] agent: Node info in sync
// :: [DEBUG] manager: Rebalanced servers, next active server is zlm1.dc1 (Addr: tcp/127.0.0.1:) (DC: dc1)
// :: [DEBUG] consul: Skipping self join check for "zlm1" since the cluster is too small
// :: [DEBUG] consul: Skipping self join check for "zlm1" since the cluster is too small
// :: [DEBUG] agent: Skipping remote check "serfHealth" since it is managed automatically
// :: [DEBUG] agent: Node info in sync //Now the consul cluser has only one node "zlm1". [root@zlm1 :: ~]
#consul members
Node Address Status Type Build Protocol DC Segment
zlm1 127.0.0.1: alive server 1.2. dc1 <all> //Type "Ctrl+C" can exit consul gracefully.
^C // :: [INFO] agent: Caught signal: interrupt
// :: [INFO] agent: Graceful shutdown disabled. Exiting
// :: [INFO] agent: Requesting shutdown
// :: [WARN] agent: dev mode disabled persistence, killing all proxies since we can't recover them
// :: [DEBUG] agent/proxy: Stopping managed Connect proxy manager
// :: [INFO] consul: shutting down server
// :: [WARN] serf: Shutdown without a Leave
// :: [WARN] serf: Shutdown without a Leave
// :: [INFO] manager: shutting down
// :: [INFO] agent: consul server down
// :: [INFO] agent: shutdown complete
// :: [INFO] agent: Stopping DNS server 127.0.0.1: (tcp)
// :: [INFO] agent: Stopping DNS server 127.0.0.1: (udp)
// :: [INFO] agent: Stopping HTTP server 127.0.0.1: (tcp)
// :: [INFO] agent: Waiting for endpoints to shut down
// :: [INFO] agent: Endpoints down
// :: [INFO] agent: Exit code: [root@zlm1 :: /usr/local/bin]
#ps aux|grep consul
root 0.0 0.0 pts/ R+ : : grep --color=auto consul [root@zlm1 :: /usr/local/bin]
#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
Prepare the server configuration file and start it again.
[root@zlm1 :: /etc/consul.d]
#cat server.json
{
"data_dir":"/data/consul",
"datacenter":"dc1",
"log_level":"INFO",
"server":true,
"bootstrap_expect":,
"bind_addr":"192.168.56.100",
"client_addr":"192.168.56.100",
"ports":{
},
"ui":true,
"retry_join":[],
"retry_interval":"3s",
"raft_protocol":,
"rejoin_after_leave":true
} [root@zlm1 :: /etc/consul.d]
#consul agent --config-dir=/etc/consul.d/ > /data/consul/consul.log >& &
[] [root@zlm1 :: /etc/consul.d]
#ps aux|grep consul
root 1.3 2.0 pts/ Sl : : consul agent --config-dir=/etc/consul.d/
root 0.0 0.0 pts/ R+ : : grep --color=auto consul [root@zlm1 :: /etc/consul.d]
#tail -f /data/consul/consul.log
// :: [INFO] agent: Started HTTP server on 192.168.56.100: (tcp)
// :: [INFO] agent: started state syncer
// :: [WARN] raft: Heartbeat timeout from "" reached, starting election
// :: [INFO] raft: Node at 192.168.56.100: [Candidate] entering Candidate state in term
// :: [INFO] raft: Election won. Tally:
// :: [INFO] raft: Node at 192.168.56.100: [Leader] entering Leader state
// :: [INFO] consul: cluster leadership acquired
// :: [INFO] consul: New leader elected: zlm1
// :: [INFO] consul: member 'zlm1' joined, marking health alive
// :: [INFO] agent: Synced node info [root@zlm1 :: ~]
#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 [root@zlm1 :: ~]
#consul members --http-addr=192.168.56.100:
Node Address Status Type Build Protocol DC Segment
zlm1 192.168.56.100: alive server 1.2. dc1 <all>
Add a client on zlm2.
[root@zlm1 :: /etc/consul.d]
#scp /root/consul zlm2:~
consul % 80MB .3MB/s : [root@zlm2 :: ~]
#mkdir /etc/consul.d [root@zlm2 :: ~]
#mkdir /data/consul [root@zlm2 :: ~]
#cd /etc/consul.d/ [root@zlm2 :: /etc/consul.d]
#ls -l
total
-rw-r--r-- root root Aug : client.json [root@zlm2 :: /etc/consul.d]
#cat client.json
{
"data_dir": "/data/consul",
"enable_script_checks": true,
"bind_addr": "192.168.56.101",
"retry_join": ["192.168.56.100"],
"retry_interval": "30s",
"rejoin_after_leave": true,
"start_join": ["192.168.56.100"]
} [root@zlm2 :: /etc/consul.d]
#consul agent -client 192.168.56.101 -bind 192.168.56.101 --config-dir=/etc/consul.d
==> Starting Consul agent...
==> Joining cluster...
Join completed. Synced with initial agents
==> Consul agent running!
Version: 'v1.2.2'
Node ID: 'a69eae21-4e31-7edf-1f1a-3ec285a8fb3b'
Node name: 'zlm2'
Datacenter: 'dc1' (Segment: '')
Server: false (Bootstrap: false)
Client Addr: [192.168.56.101] (HTTP: , HTTPS: -, DNS: )
Cluster Addr: 192.168.56.101 (LAN: , WAN: )
Encrypt: Gossip: false, TLS-Outgoing: false, TLS-Incoming: false ==> Log data will now stream in as it occurs: // :: [INFO] serf: EventMemberJoin: zlm2 192.168.56.101
// :: [INFO] agent: Started DNS server 192.168.56.101: (udp)
// :: [WARN] agent/proxy: running as root, will not start managed proxies
// :: [INFO] agent: Started DNS server 192.168.56.101: (tcp)
// :: [INFO] agent: Started HTTP server on 192.168.56.101: (tcp)
// :: [INFO] agent: (LAN) joining: [192.168.56.100]
// :: [INFO] agent: Retry join LAN is supported for: aliyun aws azure digitalocean gce os packet scaleway softlayer triton vsphere
// :: [INFO] agent: Joining LAN cluster...
// :: [INFO] agent: (LAN) joining: [192.168.56.100]
// :: [INFO] serf: EventMemberJoin: zlm1 192.168.56.100
// :: [INFO] agent: (LAN) joined: Err: <nil>
// :: [INFO] agent: started state syncer
// :: [INFO] consul: adding server zlm1 (Addr: tcp/192.168.56.100:) (DC: dc1)
// :: [INFO] agent: (LAN) joined: Err: <nil>
// :: [INFO] agent: Join LAN completed. Synced with initial agents
// :: [INFO] agent: Synced node info [root@zlm2 :: /etc/consul.d]
#consul members --http-addr=192.168.56.100:
Node Address Status Type Build Protocol DC Segment
zlm1 192.168.56.100: alive server 1.2. dc1 <all>
zlm2 192.168.56.101: alive client 1.2. dc1 <default>
Add two services on node zlm2.
[root@zlm2 :: /etc/consul.d]
#cat service_master_check.json
{
"service":
{
"name": "w_db3306",
"tags": [
"Master Satus Check"
],
"address": "192.168.56.100",
"port": ,
"check":
{
"args": [
"/data/consul/script/CheckMaster.py",
""
],
"interval": "15s"
}
}
} [root@zlm2 :: /etc/consul.d]
#cat service_slave_check.json
{
"service":
{
"name": "r_db3306",
"tags": [
"Slave Satus Check"
],
"address": "192.168.56.101",
"port": ,
"check":
{
"args": [
"/data/consul/script/CheckSlave.py",
""
],
"interval": "15s"
}
}
} [root@zlm2 :: /etc/consul.d]
#ls -l
total
-rw-r--r-- root root Aug : client.json
-rw-r--r-- root root Aug : service_master_check.json
-rw-r--r-- root root Aug : servi_slave_check.json
Check CheckMaster.py script.
[root@zlm2 :: /data/consul/script]
#cat CheckMaster.py
#!/usr/bin/python
import sys
import os
import pymysql port = int(sys.argv[])
var={}
conn = pymysql.connect(host='192.168.56.100',port=port,user='zlm',passwd='zlmzlm')
#cur = conn.cursor(pymysql.cursor.DictCursor)
cur = conn.cursor() cur.execute("show global variables like \"%read_only%\"")
rows = cur.fetchall() for r in rows:
var[r[]]=r[]
if var['read_only']=='OFF' and var['super_read_only']=='OFF':
print "MySQL %d master instance." % port
else:
print "This is read only instance."
sys.exit() sys.exit()
cur.close()
conn.close()
Check CheckSlave.py script.
[root@zlm2 :: /data/consul/script]
#cat CheckSlave.py
#!/usr/bin/python
import sys
import os
import pymysql port = int(sys.argv[])
var={}
conn = pymysql.connect(host='192.168.56.101',port=port,user='zlm',passwd='zlmzlm')
cur = conn.cursor
cur.execute("show global variables like \"%read_only%\"")
rows = cur.fetchall() for r in rows:
var[r[]]=r[]
if var['read_only']=='OFF' and var['super_read_only']=='OFF':
print "MySQL %d master instance." % port
sys.exit()
else:
print "MySQL %d is read only instance." % port cur = conn.cursor(pymysql.cursors.DictCursor)
cur.execute("show slave status")
slave_status = cur.fetchone() if len(slave_status)<:
print "Slave replication setup error.";
sys.exit() if slave_status['Slave_IO_Running'] !='Yes' or slave_status['Slave_SQL_Running'] !='Yes':
print "Replication error: replication from host=%s, port=%s, io_thread=%s, sql_thread=%s, error info %s %s" % (slave_status['Master_Host'],slave_status['Master_Port'],slave_status['Slave_IO_Running'],slave_status['Slave_SQL_Running'],slave_status['Last_IO_Error'],slave_status['Last_SQL_Error'])
sys.exit()
print slave_status sys.exit()
cur.close()
conn.close()
Restartt consul(or reload).
[root@zlm2 :: /etc/consul.d]
#consul members --http-addr=192.168.56.100:
Node Address Status Type Build Protocol DC Segment
zlm1 192.168.56.100: alive server 1.2. dc1 <all>
zlm2 192.168.56.101: alive client 1.2. dc1 <default> [root@zlm2 :: /etc/consul.d]
#consul leave --http-addr=192.168.56.101:
Graceful leave complete [root@zlm2 :: /etc/consul.d]
#consul members --http-addr=192.168.56.100:
Node Address Status Type Build Protocol DC Segment
zlm1 192.168.56.100: alive server 1.2. dc1 <all>
zlm2 192.168.56.101: left client 1.2. dc1 <default> [root@zlm2 :: /etc/consul.d]
#consul agent --config-dir=/etc/consul.d/ -client 192.168.56.101 > /data/consul/consul.log >& &
[] [root@zlm2 :: /etc/consul.d]
#!ps
ps aux|grep consul
root 2.3 2.0 pts/ Sl : : consul agent --config-dir=/etc/consul.d/ -client 192.168.56.101
root 0.0 0.0 pts/ R+ : : grep --color=auto consul [root@zlm2 :: /etc/consul.d]
#consul reload -http-addr=192.168.56.101:
Configuration reload triggered
Well,now we can login the dashbord(GUI) of consul to check MySQL working status.
5UCMCU%7BTK48ED1)OBL.png)
Consul初体验的更多相关文章
- consul 初体验
consul server: 192.168.48.134: #!/bin/bash cd /data/server/consuls nohup /data/server/consuls/consul ...
- Consul在.Net Core中初体验
Consul在.Net Core中初体验 简介 在阅读本文前我想您应该对微服务架构有一个基本的或者模糊的了解 Consul是一个服务管理软件,它其实有很多组件,包括服务发现配置共享键值对存储等 本文主 ...
- .NET平台开源项目速览(15)文档数据库RavenDB-介绍与初体验
不知不觉,“.NET平台开源项目速览“系列文章已经15篇了,每一篇都非常受欢迎,可能技术水平不高,但足够入门了.虽然工作很忙,但还是会抽空把自己知道的,已经平时遇到的好的开源项目分享出来.今天就给大家 ...
- Xamarin+Prism开发详解四：简单Mac OS 虚拟机安装方法与Visual Studio for Mac 初体验
Mac OS 虚拟机安装方法 最近把自己的电脑升级了一下SSD固态硬盘,总算是有容量安装Mac 虚拟机了!经过心碎的安装探索,尝试了国内外的各种安装方法,最后在youtube上找到了一个好方法. 简单 ...
- Spring之初体验
Spring之初体验 Spring是一个轻量级的Java Web开发框架,以IoC(Inverse of Control 控制反转)和 ...
- Xamarin.iOS开发初体验
aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAKwAAAA+CAIAAAA5/WfHAAAJrklEQVR4nO2c/VdTRxrH+wfdU84pW0
- 【腾讯Bugly干货分享】基于 Webpack & Vue & Vue-Router 的 SPA 初体验
本文来自于腾讯bugly开发者社区,非经作者同意,请勿转载,原文地址:http://dev.qq.com/topic/57d13a57132ff21c38110186 导语 最近这几年的前端圈子,由于 ...
- 【Knockout.js 学习体验之旅】（1）ko初体验
前言 什么,你现在还在看knockout.js?这货都已经落后主流一千年了!赶紧去学Angular.React啊,再不赶紧的话,他们也要变out了哦.身旁的90后小伙伴,嘴里还塞着山东的狗不理大蒜包, ...
- 在同一个硬盘上安装多个 Linux 发行版及 Fedora 21 、Fedora 22 初体验
在同一个硬盘上安装多个 Linux 发行版 以前对多个 Linux 发行版的折腾主要是在虚拟机上完成.我的桌面电脑性能比较强大,玩玩虚拟机没啥问题,但是笔记本电脑就不行了.要在我的笔记本电脑上折腾多个 ...
随机推荐
- PHP数组和字符串相互转换以及判断字符串长度
这里只介绍最常用的方法: $array=explode(separator,$string); $string=implode(glue,$array); explode() 函数用来将字符串打散成数 ...
- TunSafe使用分享
体验还是很棒的,关于使用中遇到的一些问题在此分享下 官网打不开? 这个真的很不解,科学以后遇到的, 后来在手机上同样的环境测试可以打开 最后居然使用ie浏览器解决了,看来是国产浏览器在作怪 ie终于打 ...
- 【转】java.lang.ClassNotFoundException: org.springframework.context.event.GenericApplicationListener
http://www.cnblogs.com/softidea/p/6064091.html Caused by: java.lang.NoClassDefFoundError: org/spring ...
- P2916 [USACO08NOV]安慰奶牛Cheering up the Cow
往奶牛里打气 题目评级不难. 感觉思路有值得借鉴的地方.(虽然少,毕竟积沙成塔吗qwq) 很容易看出来,是要求最小生成树的. 然后生成树的计算方式不一样. 我们考虑拼接(感觉大部分oi都可以使用类似的 ...
- ListView 中嵌套 GridView
1.主布局文件 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:andr ...
- Vertical-Align你应该知道的一切
好,我们聊聊vertical-align.这个属性主要目的用于将相邻的文本与元素对齐.而实际上,verticle-algin可以在不同上下文中灵活地对齐元素,以及进行细粒度的控制,不必知道元素的大小. ...
- Intermediate_JVM 20180306 : 运行时数据区域
Java比起C++一个很大的进步就在于Java不用再手动控制指针的delete与free,统一交由JVM管理,但也正因为如此,一旦出现内存溢出异常,不了解JVM,那么排查问题将会变成一项艰难的工作. ...
- JAVA交通规则
第一个JAVA程序的编写和运行 1.使用记事本编辑: public class Welcome { public static void main(String[] args) { System.ou ...
- trunc(sysdate)的含义是什么
1.ORACLE中TRUNC是截取的函数
- Vue中把从后端取出的时间进行截取
未截取前 截取后 方法: </div>{{times}}</div> export default{ data() { return { // getTime储存从服务器请求回 ...