前言
关于MySQL中间件的产品也很多,之前用过了360的Atlas、玩过MyCat。这边我选择 Maxscale的原因就是功能能满足需求,也看好他的未来发展。
其实有关于如何安装 Maxscale的文章百度一下一大把，写这篇文章主要为了说明配置的某些现象，同时也为之后使用Maxscale的其他配置做下基础。
我的环境
这边我的'一主二从'已经是搭建好的了，如何搭建就不再描述了。
注意：这边我的三个节点都没有开启 GTID，具体是为什么在之后会讲到，这边大家留意一下就行。
|
192.168.137.11 (Maxscale)
192.168.137.21:3306 (Master)
192.168.137.22:3306 (Slave)
192.168.137.23:3306 (Slave)
|
这边我使用的用于复制的用户是maxscale,具体权限如下:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
CREATE USER maxscale@'%' IDENTIFIED BY "123456";
GRANT replication slave, replication client ON *.* TO maxscale@'%';
GRANT SELECT ON mysql.* TO maxscale@'%';
GRANT ALL ON maxscale_schema.* TO maxscale@'%';
GRANT SHOW DATABASES ON *.* TO maxscale@'%';
root@(none) 22:34:15>SELECT VERSION();
+--------------------+
| VERSION() |
+--------------------+
| 10.1.8-MariaDB-log |
+--------------------+
1 row in set (0.00 sec)
root@(none) 22:34:25>SHOW SLAVE HOSTS;
+------------+----------------+------+------------+
| Server_id | Host | Port | Master_id |
+------------+----------------+------+------------+
| 3306137022 | 192.168.137.21 | 3306 | 3306137021 |
| 3306137023 | 192.168.137.21 | 3306 | 3306137021 |
+------------+----------------+------+------------+
2 rows in set (0.00 sec)
|
下载Maxscale
在 192.168.137.11 机器上
这边提供下载地址: https://downloads.mariadb.com
我的版本
|
1
2
3
4
5
6
|
[root@normal_11 opt]# pwd
/opt
[root@normal_11 opt]# ll
total 149624
-rw-r--r-- 1 root root 3587510 Nov 2 21:07 maxscale-2.0.1.centos.7.tar.gz
|
开始安装
|
1
2
3
4
5
6
7
8
9
10
11
12
|
[root@normal_11 opt]# groupadd maxscale
[root@normal_11 opt]# useradd -g maxscale maxscale
[root@normal_11 opt]# cd /opt
[root@normal_11 opt]# tar -zxf maxscale-2.0.1.centos.7.tar.gz
[root@normal_11 opt]# ln -s maxscale-2.0.1.centos.7 /usr/local/maxscale
[root@normal_11 opt]# chown -R maxscale:maxscale /usr/local/maxscale
[root@normal_11 opt]# mkdir -p /u01/maxscale/{data,cache,logs,tmp}
[root@normal_11 opt]# mkdir -p /u01/maxscale/logs/{binlog,trace}
[root@normal_11 opt]# chown -R maxscale:maxscale /u01/maxscale
[root@normal_11 opt]# /usr/local/maxscale/bin/maxkeys /u01/maxscale/data/
[root@normal_11 opt]# /usr/local/maxscale/bin/maxpasswd /u01/maxscale/data/.secrets 123456
1D30C1E689410756D7B82C233FCBF8D9
|
Maxscale 配置文件
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
[root@normal_11 opt]# cat /etc/maxscale.cnf
###################################################
# CREATE USER maxscale@'%' IDENTIFIED BY "123456";
# GRANT replication slave, replication client ON *.* TO maxscale@'%';
# GRANT SELECT ON mysql.* TO maxscale@'%';
# GRANT ALL ON maxscale_schema.* TO maxscale@'%';
# GRANT SHOW DATABASES ON *.* TO maxscale@'%';
# groupadd maxscale
# useradd -g maxscale maxscale
# cd /opt
# tar -zxf maxscale-2.0.1.rhel.7.tar.gz
# ln -s /opt/maxscale-2.0.1.rhel.7 /usr/local/maxscale
# chown -R maxscale:maxscale /usr/local/maxscale
# mkdir -p /u01/maxscale/{data,cache,logs,tmp}
# mkdir -p /u01/maxscale/logs/{binlog,trace}
# chown -R maxscale:maxscale /u01/maxscale
# /usr/local/maxscale/bin/maxkeys /u01/maxscale/data/
# /usr/local/maxscale/bin/maxpasswd /u01/maxscale/data/.secrets 123456
###################################################
[maxscale]
# 开启线程个数，默认为1.设置为auto会同cpu核数相同
threads=auto
# timestamp精度
ms_timestamp=1
# 将日志写入到syslog中
syslog=1
# 将日志写入到maxscale的日志文件中
maxlog=1
# 不将日志写入到共享缓存中，开启debug模式时可打开加快速度
log_to_shm=0
# 记录告警信息
log_warning=1
# 记录notice
log_notice=1
# 记录info
log_info=1
# 不打开debug模式
log_debug=0
# 日志递增
log_augmentation=1
# 相关目录设置
basedir=/usr/local/maxscale/
logdir=/u01/maxscale/logs/trace/
datadir=/u01/maxscale/data/
cachedir=/u01/maxscale/cache/
piddir=/u01/maxscale/tmp/
[server1]
type=server
address=192.168.137.21
port=3306
protocol=MySQLBackend
serv_weight=1
[server2]
type=server
address=192.168.137.22
port=3306
protocol=MySQLBackend
serv_weight=3
[server3]
type=server
address=192.168.137.23
port=3306
protocol=MySQLBackend
serv_weight=3
[MySQL Monitor]
type=monitor
module=mysqlmon
servers=server1,server2,server3
user=maxscale
passwd=1D30C1E689410756D7B82C233FCBF8D9
# 监控心态为 10s
monitor_interval=10000
# 当复制slave全部断掉时，maxscale仍然可用，将所有的访问指向master节点
detect_stale_master=true
# 监控主从复制延迟，可用后续指定router service的(配置此参数请求会永远落在 master)
# detect_replication_lag=true
[Read-Only Service]
type=service
router=readconnroute
servers=server1,server2,server3
user=maxscale
passwd=1D30C1E689410756D7B82C233FCBF8D9
router_options=slave
# 允许root用户登录执行
enable_root_user=1
# 查询权重
weightby=serv_weight
[Read-Write Service]
type=service
router=readwritesplit
servers=server1,server2,server3
user=maxscale
passwd=1D30C1E689410756D7B82C233FCBF8D9
max_slave_connections=100%
# sql语句中的存在变量只指向master中执行
use_sql_variables_in=master
# 允许root用户登录执行
enable_root_user=1
# 允许主从最大间隔(s)
max_slave_replication_lag=3600
[MaxAdmin Service]
type=service
router=cli
[Read-Only Listener]
type=listener
service=Read-Only Service
protocol=MySQLClient
port=4008
[Read-Write Listener]
type=listener
service=Read-Write Service
protocol=MySQLClient
port=4006
[MaxAdmin Listener]
type=listener
service=MaxAdmin Service
protocol=maxscaled
socket=/u01/maxscale/tmp/maxadmin.sock
port=6603
|
细心的朋友会注意到, 的我配置文件最上面就是安装 Maxscale 的基本步骤，这是本人的一个习惯.
这边我稍微说明一下配置文件的意思:
- [server1], [server2], [server3] 我配置了三个Maxscale需要连接的MySQL服务
- [MySQL Monitor] 配置一个监听服务, 同时监听着 [server1], [server2], [server3] 的状态
- [Read-Only Service] 配置了只读服务, 只在[server2], [server3]中执行
注意: 虽然是只读服务但是同样可以执行 DML DDL, 说以要限制好用户的权限.
- [Read-Write Listener] 配置了读写分离的服务
- [MaxAdmin Listener] 配置了用户管理Maxscale的服务
演示
这边我们以 [Read-Write Listener] 配置的服务来演示读写分离情况
- 启动 Maxscale
如果启动有报错那就查看一下日志 /var/log/message 或 /u01/maxscale/logs/trace/maxscale1.log(自定义)
|
1
2
3
4
5
6
7
8
|
[root@normal_11 opt]# /usr/local/maxscale/bin/maxscale -f /etc/maxscale.cnf
[root@normal_11 opt]# netstat -natpl | grep max
tcp 0 0 0.0.0.0:4008 0.0.0.0:* LISTEN 5507/maxscale
tcp 0 0 0.0.0.0:6603 0.0.0.0:* LISTEN 5507/maxscale
tcp 0 0 0.0.0.0:4006 0.0.0.0:* LISTEN 5507/maxscale
tcp 0 0 192.168.137.11:43102 192.168.137.22:3306 ESTABLISHED 5507/maxscale
tcp 0 0 192.168.137.11:54624 192.168.137.21:3306 ESTABLISHED 5507/maxscale
tcp 0 0 192.168.137.11:52989 192.168.137.23:3306 ESTABLISHED 5507/maxscale
|
- 使用 maxadmin 查看服务
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
[root@normal_11 opt]# /usr/local/maxscale/bin/maxadmin -S /u01/maxscale/tmp/maxadmin.sock
MaxScale> list servers
Servers.
-------------------+-----------------+-------+-------------+--------------------
Server | Address | Port | Connections | Status
-------------------+-----------------+-------+-------------+--------------------
server1 | 192.168.137.21 | 3306 | 0 | Master, Running
server2 | 192.168.137.22 | 3306 | 0 | Slave, Running
server3 | 192.168.137.23 | 3306 | 0 | Slave, Running
-------------------+-----------------+-------+-------------+--------------------
MaxScale> list services
Services.
--------------------------+----------------------+--------+---------------
Service Name | Router Module | #Users | Total Sessions
--------------------------+----------------------+--------+---------------
Read-Only Service | readconnroute | 1 | 1
Read-Write Service | readwritesplit | 1 | 1
MaxAdmin Service | cli | 3 | 3
--------------------------+----------------------+--------+---------------
|
通过登录Maxscale的读写分离服务, 来执行sql并且查看日志，查看日志路由情况。
注意: 这边登录的用户就是普通的MySQL用户, 不是maxscale用户
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
[root@normal_11 opt]# mysql -uHH -p -h192.168.137.11 -P4006
Logging to file '/u01/mysql_history/query.log'
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5524
Server version: 5.5.5-10.0.0 2.0.1-maxscale MariaDB Server
Copyright (c) 2009-2015 Percona LLC and/or its affiliates
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
HH@192.168.137.11 11:13:46 [(none)]>SELECT * FROM test.t1;
+----+------+-----+
| id | name | age |
+----+------+-----+
| 1 | HH1 | 1 |
| 2 | HH2 | 2 |
| 3 | HH3 | 3 |
+----+------+-----+
3 rows in set (0.01 sec)
HH@192.168.137.11 11:15:03 [(none)]>INSERT INTO test.t1 VALUES(NULL, 'HH4', 4);
Query OK, 1 row affected (0.01 sec)
# 使用 HH 登录成的日志
2016-11-03 23:13:46.907 info : (log_server_connections): Servers and router connection counts:
2016-11-03 23:13:46.907 info : (log_server_connections): current operations : 0 in 192.168.137.21:3306 RUNNING MASTER
2016-11-03 23:13:46.907 info : (log_server_connections): current operations : 0 in 192.168.137.22:3306 RUNNING SLAVE
2016-11-03 23:13:46.907 info : (log_server_connections): current operations : 0 in 192.168.137.23:3306 RUNNING SLAVE
2016-11-03 23:13:46.908 info : (select_connect_backend_servers): Selected RUNNING MASTER in 192.168.137.21:3306
2016-11-03 23:13:46.908 info : (select_connect_backend_servers): Selected RUNNING SLAVE in 192.168.137.22:3306
2016-11-03 23:13:46.908 info : (select_connect_backend_servers): Selected RUNNING SLAVE in 192.168.137.23:3306
2016-11-03 23:13:46.908 info : (session_alloc): Started Read-Write Service client session [0] for 'HH' from 192.168.137.11
2016-11-03 23:13:46.909 [9] info : (route_single_stmt): > Autocommit: [enabled], trx is [not open], cmd: COM_QUERY, type: QUERY_TYPE_READ|QUERY_TYPE_SYSVAR_READ, stmt: select @@version_comment limit 1
2016-11-03 23:13:46.909 [9] info : (route_single_stmt): Route query to master 192.168.137.21:3306 <
2016-11-03 23:13:46.922 [9] info : (route_single_stmt): > Autocommit: [enabled], trx is [not open], cmd: COM_QUERY, type: QUERY_TYPE_READ, stmt: select USER()
2016-11-03 23:13:46.922 [9] info : (route_single_stmt): Route query to slave 192.168.137.22:3306 <
# 执行 SELECT * FROM test.t1 语句被路由到 192.168.137.22:3306[server2]中的日志
2016-11-03 23:15:02.618 [9] info : (route_single_stmt): > Autocommit: [enabled], trx is [not open], cmd: COM_QUERY, type: QUERY_TYPE_READ, stmt: SELECT * FROM test.t1
2016-11-03 23:15:02.618 [9] info : (route_single_stmt): Route query to slave 192.168.137.22:3306 <
# 执行 INSERT INTO test.t1 VALUES(NULL, 'HH4', 4) 语句被路由到 192.168.137.21:3306[server1]中的日志
2016-11-03 23:17:02.716 [9] info : (route_single_stmt): > Autocommit: [enabled], trx is [not open], cmd: COM_QUERY, type: QUERY_TYPE_WRITE, stmt: INSERT INTO test.t1 VALUES(NULL, 'HH4', 4)
2016-11-03 23:17:02.716 [9] info : (route_single_stmt): Route query to master 192.168.137.21:3306 <
|
上面是最基本的读写分离操作
重点参数说明与演示
有许多刚刚搭建Maxscale的朋友会问到为什么我的select总是落在Master上,影响比较大的参数有两个,如下:
|
1
2
3
4
5
|
# 监控主从复制延迟，可用后续指定router service的(配置此参数请求会永远落在 master)
detect_replication_lag=true
# 允许主从最大间隔(s).有些朋友在做压力测试的是会说SELECT 会打在Master,多半是这个参数
max_slave_replication_lag=3600
|
- detect_replication_lag=true 时的现象
执行 SELECT 语句
|
1
2
3
4
5
6
7
8
9
10
|
HH@192.168.137.11 11:24:59 [(none)]>SELECT * FROM test.t1;
+----+------+-----+
| id | name | age |
+----+------+-----+
| 1 | HH1 | 1 |
| 2 | HH2 | 2 |
| 3 | HH3 | 3 |
| 4 | HH4 | 4 |
+----+------+-----+
4 rows in set (0.00 sec)
|
查看路由的日志
|
1
2
3
|
# 该查询落在了Master(192.168.137.21:3306)[server1]上了
2016-11-03 23:25:04.364 [7] info : (route_single_stmt): > Autocommit: [enabled], trx is [not open], cmd: COM_QUERY, type: QUERY_TYPE_READ, stmt: SELECT * FROM test.t1
2016-11-03 23:25:04.364 [7] info : (route_single_stmt): Route query to master 192.168.137.21:3306 <
|
所以我的配置是将 detect_replication_lag=true 给注释了也就是用默认值false.
关于 max_slave_replication_lag 这个参数我就不演示了, 因为涉及到了使用 sysbench 等压力工具不在本文范畴, 有兴趣的自己玩玩, 这边就说说该参数的意义。
文章评论
Very good blog! Do you have any recommendations for aspiring
writers? I'm hoping to start my own site soon but I'm a little lost on everything.
Would you suggest starting with a free platform like Wordpress or go for
a paid option? There are so many options out there that I'm completely overwhelmed ..
Any recommendations? Many thanks! 0mniartist asmr
I know this web page presents quality depending content and additional data, is there any other website which
offers these data in quality? 0mniartist asmr
I am genuinely grateful to the owner of this website who
has shared this impressive paragraph at at this place.
asmr 0mniartist
Its such as you learn my mind! You seem to grasp
so much about this, like you wrote the e book in it or something.
I feel that you could do with some percent to drive the message home a bit, however other than that,
this is fantastic blog. A great read. I'll definitely be back.
0mniartist asmr
Having read this I thought it was extremely enlightening.
I appreciate you finding the time and effort
to put this informative article together. I once again find myself personally spending a significant amount of time both reading and posting comments.
But so what, it was still worth it!
you're in point of fact a good webmaster. The website loading
pace is incredible. It kind of feels that you're doing any distinctive
trick. In addition, The contents are masterpiece.
you have performed a magnificent task on this topic!
My web site ... <a href="https://918kiss-m.com/pussy888/">pussy888app</a>
This blog was... how do I say it? Relevant!! Finally I have found something that
helped me. Cheers!
Also visit my web blog ... <a href="https://918kiss-m.com/playboy2/">gema playboy2</a>
Good information. Lucky me I found your blog by accident (stumbleupon).
I've book marked it for later!
My site: <a href="https://918kiss-m.com/love138/">love138 online</a>
I am extremely inspired with your writing talents and
also with the structure in your blog. Is this a paid subject or did you
customize it your self? Anyway stay up the nice high quality writing, it is rare to look a great blog like this one these days..
Also visit my web-site ... <a href="https://918kiss-m.com/aaa1188/">aaa1188 slot game list</a>
I do not know if it's just me or if perhaps everybody else
encountering issues with your website. It seems like
some of the written text within your posts are running off the screen. Can somebody else please comment
and let me know if this is happening to them as well?
This might be a problem with my browser because I've had this happen before.
Cheers
Here is my web-site: <a href="https://918kiss-m.com/lpe88/">lpe88</a>
It's amazing to visit this site and reading the views of all mates about
this paragraph, while I am also zealous of getting familiarity.
my page - <a href="https://918kiss-m.com/918kaya/">918kaya download pc</a>
If you would like to improve your know-how just keep visiting this site
and be updated with the most up-to-date news update posted here.
Here is my homepage <a href="https://918kiss-m.com/greatwall99/">download slot game greatwall99</a>
Why people still use to read news papers when in this technological world everything is accessible on web?
Check out my page: <a href="http://www.cowerdesign.com/wikI/ManiehwRoddkd">http://www.cowerdesign.com/</a>
Pretty great post. I simply stumbled upon your blog and wanted to say that I
have truly loved surfing around your weblog posts. In any
case I'll be subscribing to your rss feed and I hope you write once more
soon!
my web blog :: <a href="https://oathbreakermtg.org/forums/users/ellisbarrington/">oathbreakermtg.org</a>
Highly energetic post, I liked that bit. Will there be a
part 2?
My page :: <a href="http://lechon.ca/index.php/blog/664617/do-male-enhancement-pills-actually-work-for-troops/">http://lechon.ca/</a>
You are my inhalation, I own few blogs and often run out from post :
).
my website: <a href="https://alichehade.net/community/profile/simoigeorgetta/">Andres</a>
This is really interesting, You are a very skilled blogger.
I've joined your rss feed and look forward to seeking more
of your magnificent post. Also, I have shared your web
site in my social networks!
Also visit my web-site :: <a href="http://www.craksracing.com/modules.php?name=Your_Account&op=userinfo&username=MacCormickVern">http://www.craksracing.com/modules.php?name=Your_Account&op=userinfo&username=MacCormickVern</a>
Your way of explaining everything in this piece of writing is genuinely
nice, every one be able to easily be aware of it, Thanks a lot.
asmr 0mniartist
thank you for all your efforts that you have put in this.
Very interesting info.
Feel free to surf to my web blog <a href="http://bookmarkstumble.com/story3079208/profile-of-leblancrosella">http://bookmarkstumble.com/story3079208/profile-of-leblancrosella</a>
With havin so much content and articles do you ever run into any issues
of plagorism or copyright infringement? My blog has a lot of exclusive content
I've either written myself or outsourced but it appears a lot of it
is popping it up all over the internet without my
permission. Do you know any methods to help prevent content from being
stolen? I'd certainly appreciate it.
Hey There. I discovered your blog the usage of msn. This is a very neatly written article.
I will make sure to bookmark it and return to
read extra of your useful information. Thanks for the post.
I'll certainly return.
I am regular reader, how are you everybody? This post posted at this web page is genuinely nice.
It's actually a cool and helpful piece of information.
I'm glad that you just shared this helpful information with us.
Please keep us up to date like this. Thanks for sharing.
There's definately a great deal to know about this subject.
I really like all the points you've made.
hello there and thank you for your info – I
have certainly picked up anything new from right here.
I did however expertise some technical issues using this web site, since I experienced to reload the website lots of times previous
to I could get it to load correctly. I had been wondering if your web hosting is OK?
Not that I'm complaining, but slow loading instances times will very frequently affect your placement
in google and can damage your high quality score if ads and marketing with Adwords.
Anyway I'm adding this RSS to my email and can look out for a
lot more of your respective exciting content. Ensure that you update this again very soon.
Marvelous, what a web site it is! This website gives useful facts to us, keep it
up.
<a href="https://paydayloanssl.com/">pay day game</a>
<a href="http://modafinilwithoutrx.com/">where to get modafinil canada</a>
<a href="http://cashadvancetip.com/">quick cash payday loans</a>
<a href="https://qpersonalloans.com/">buy now pay later bad credit</a>
<a href=https://vsprednisonev.com>no prescription prednisone
<a href="http://ninelending.com/">online loans no credit</a>
<a href="http://yourpaydayloansonline.com/">direct lender payday</a>
<a href="http://edmedcialis.com/">tadalafil online 10mg</a>
<a href="http://lendingbush.com/">personal loan fast</a>