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.
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