MHA 一主兩從搭建

阿新 • • 發佈：2017-10-06

ring ssh-key set fault 配置 remote change use cat

環境介紹：
主機名 IP MHA角色 MySQL角色
node1 192.168.56.26 Node MySQL Master
node2 192.168.56.27 Node MySQL Master behind
node3 192.168.56.28 Node MySQL slave
node4 192.168.56.36 Manager None

所有主機 /etc/hosts 添加信息
192.168.56.26 node1
192.168.56.27 node2
192.168.56.28 node3
192.168.56.36 node4

關閉selinux
永久生效：
/etc/selinux/config 文件修改如下參數
SELINUX=disabled

臨時生效：
setenforce 0

關閉防火墻
chkconfig iptables off
chkconfig ip6tables off

/etc/init.d/iptables stop

安裝MySQL：

解壓軟件
mkdir /opt/mysql
mv mysql-5.6.34-linux-glibc2.5-x86_64.tar.gz /opt/mysql
cd /opt/mysql
tar -zxvf mysql-5.6.34-linux-glibc2.5-x86_64.tar.gz

創建軟連接
ln -s /opt/mysql/mysql-5.6.34-linux-glibc2.5-x86_64 /usr/local/mysql

創建運行用戶
groupadd mysql
useradd -g mysql -d /usr/local/mysql -s /sbin/nologin -M -n mysql

創建所需的目錄
mkdir -p /data/mysql/3307/{data,logs,tmp}
chown -R mysql:mysql /data/mysql/3307/
chown -R mysql:mysql /usr/local/mysql

配置文件內容
#my.cnf
[client]
port = 3307
socket = /data/mysql/3307/tmp/3307.sock

[mysql]
#pager="less -i -n -S"
#tee=/opt/mysql/query.log
no-auto-rehash

[mysqld]
#misc
user = mysql
basedir = /usr/local/mysql
datadir = /data/mysql/3307/data
port = 3307
socket = /data/mysql/3307/tmp/3307.sock
event_scheduler = 0

tmpdir = /data/mysql/3307/tmp
#timeout
interactive_timeout = 300
wait_timeout = 300

#character set
character-set-server = utf8

open_files_limit = 65535
max_connections = 100
max_connect_errors = 100000
lower_case_table_names =1

#symi replication

#rpl_semi_sync_master_enabled=1
#rpl_semi_sync_master_timeout=1000 # 1 second
#rpl_semi_sync_slave_enabled=1

#logs
log-output=file
slow_query_log = 1
slow_query_log_file = slow.log
log-error = error.log
log_warnings = 2
pid-file = mysql.pid
long_query_time = 1
#log-slow-admin-statements = 1
#log-queries-not-using-indexes = 1
log-slow-slave-statements = 1

#binlog
#binlog_format = STATEMENT
binlog_format = row
server-id = 330728
log-bin = /data/mysql/3307/logs/mysql-bin
binlog_cache_size = 4M
max_binlog_size = 256M
max_binlog_cache_size = 1M
sync_binlog = 0
expire_logs_days = 10
#procedure
log_bin_trust_function_creators=1

#
#gtid-mode = on
#enforce-gtid-consistency=1

#relay log
skip_slave_start = 1
max_relay_log_size = 128M
relay_log_purge = 1
relay_log_recovery = 1
relay-log=relay-bin
relay-log-index=relay-bin.index
log_slave_updates
#slave-skip-errors=1032,1053,1062
#skip-grant-tables

#buffers & cache
table_open_cache = 2048
table_definition_cache = 2048
table_open_cache = 2048
max_heap_table_size = 96M
sort_buffer_size = 128K
join_buffer_size = 128K
thread_cache_size = 200
query_cache_size = 0
query_cache_type = 0
query_cache_limit = 256K
query_cache_min_res_unit = 512
thread_stack = 192K
tmp_table_size = 96M
key_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 16M
bulk_insert_buffer_size = 32M

#myisam
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1

#innodb
innodb_buffer_pool_size = 100M
innodb_buffer_pool_instances = 1
innodb_data_file_path = ibdata1:100M:autoextend
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 8M
innodb_log_file_size = 100M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 50
innodb_file_per_table = 1
innodb_rollback_on_timeout
innodb_status_file = 1
innodb_io_capacity = 100
transaction_isolation = READ-COMMITTED
innodb_flush_method = O_DIRECT

修改my3307.cnf權限
chown mysql:mysql /etc/my.cnf

初始化數據庫
/usr/local/mysql/scripts/mysql_install_db --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql --datadir=/data/mysql/3307/data --user=mysql

設置環境變量
echo "export PATH=$PATH:/usr/local/mysql/bin">> /etc/profile
source /etc/profile

cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld

啟動MySQL
/etc/init.d/mysqld start

賬號處理
grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘chengce243‘ with grant option;
delete from mysql.user where password =‘‘;
flush privileges;

搭建從庫
主庫創建復制賬號
create user ‘repl‘@‘192.168.56.%‘ identified by ‘chengce243‘;
grant replication slave on *.* to ‘repl‘@‘192.168.56.%‘;
flush privileges;

兩個從庫分別執行如下語句
MASTER_LOG_FILE 和 MASTER_LOG_POS 值，從主庫 show master status;查看

CHANGE MASTER TO MASTER_HOST=‘192.168.56.26‘,MASTER_USER=‘repl‘,MASTER_PASSWORD=‘chengce243‘,MASTER_PORT=3307,MASTER_LOG_FILE=‘mysql-bin.000003‘,MASTER_LOG_POS=1718;

兩個從庫分別開啟復制
start slave;

主庫上創建
create user ‘mhauser‘@‘192.168.56.%‘ identified by ‘chengce243‘;
grant all privileges on *.* to ‘mhauser‘@‘192.168.56.%‘;
flush privileges;

主庫上
set global relay_log_purge=OFF;
set global read_only=OFF;

兩個從庫上
set global relay_log_purge=OFF;
set global read_only=ON;

分別配置root用戶和mysql用戶互信

生成互信文件，輸入如下命令，一路回車就行
ssh-keygen

cd ~/.ssh

cat id_rsa.pub > authorized_keys
chmod 600 *
cd ~/
scp -r .ssh 192.168.56.27:~/
scp -r .ssh 192.168.56.28:~/
scp -r .ssh 192.168.56.36:~/

最後每個節點都要驗證
ssh node1 date
ssh node2 date
ssh node3 date
ssh node4 date

每個節點都要安裝相關依賴包
yum install -y perl-devel
yum install -y perl-CPAN
yum install -y perl-Time-HiRes
yum install -y perl-DBD-MySQL
yum install -y perl-Params-Validate

yum install -y perl-Config-Tiny
yum install -y perl-Log-Dispatch
yum install -y perl-Parallel-ForkManager

MHA master節點，即node4安裝
rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm
rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm

MHA node節點，即node1/node2/node3安裝
rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm

為MHA的相關配置信息的存放規劃目錄結構（四臺服務器均要操作）：
mkdir -p /masterha_work/{conf,manager_workdir,rmt_mysql_binlog_workdir,script_dir,log}

自定義規則：
conf，存放MHA的配置文件
log，存放於MHA有關的日誌信息
script_dir，除了默認的存放腳本的位置外，另一個存放自定義的或者官方提供的腳本的位置
manager_workdir，Manager的工作目錄
rmt_mysql_binlog_workdir，當發生切換的時候，MySQL的binlog的臨時存放路徑

修改配置目錄權限：
chown -R mysql:mysql /masterha_work

[[email protected] conf]# cat /masterha_work/conf/mha_total.cnf

[server default]
manager_workdir=/masterha_work/manager_workdir
manager_log=/masterha_work/log/manager.log

master_binlog_dir=/data/mysql/3307/logs
user=mhauser
password=chengce243

#master_ip_failover_script=/usr/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=node1 --orig_master_ip=192.168.56.26 --orig_master_port=3307
master_ip_online_change_script=/usr/bin/master_ip_online_change

ping_interval=1

remote_workdir=/masterha_work/rmt_mysql_binlog_workdir

repl_user=repl
repl_password=chengce243
port=3307

report_script=/usr/bin/send_report

secondary_check_script=/usr/local/bin/masterha_secondary_check -s node2 -s node1 --user=mhame --master_host=node2 --master_ip=192.168.56.27 --master_port=3307
shutdown_script=""

ssh_user=root

[server1]
hostname=192.168.56.26
port=3307

[server2]
hostname=192.168.56.27
candidate_master=1
check_repl_delay=0
port=3307

[server3]
hostname=192.168.56.28
port=3307
no_master=1

測試SSH連通性：

[[email protected] conf]# masterha_check_ssh --conf=/masterha_work/conf/mha_total.cnf
Sun Oct 1 19:07:20 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Sun Oct 1 19:07:20 2017 - [info] Reading application default configuration from /masterha_work/conf/mha_total.cnf..
Sun Oct 1 19:07:20 2017 - [info] Reading server configuration from /masterha_work/conf/mha_total.cnf..
Sun Oct 1 19:07:20 2017 - [info] Starting SSH connection tests..
Sun Oct 1 19:07:21 2017 - [debug]
Sun Oct 1 19:07:20 2017 - [debug] Connecting via SSH from [email protected](192.168.56.26:22) to [email protected](192.168.56.27:22)..
Sun Oct 1 19:07:20 2017 - [debug] ok.
Sun Oct 1 19:07:20 2017 - [debug] Connecting via SSH from [email protected](192.168.56.26:22) to [email protected](192.168.56.28:22)..
Sun Oct 1 19:07:21 2017 - [debug] ok.
Sun Oct 1 19:07:21 2017 - [debug]
Sun Oct 1 19:07:20 2017 - [debug] Connecting via SSH from [email protected](192.168.56.27:22) to [email protected](192.168.56.26:22)..
Sun Oct 1 19:07:21 2017 - [debug] ok.
Sun Oct 1 19:07:21 2017 - [debug] Connecting via SSH from [email protected](192.168.56.27:22) to [email protected](192.168.56.28:22)..
Sun Oct 1 19:07:21 2017 - [debug] ok.
Sun Oct 1 19:07:22 2017 - [debug]
Sun Oct 1 19:07:21 2017 - [debug] Connecting via SSH from [email protected](192.168.56.28:22) to [email protected](192.168.56.26:22)..
Sun Oct 1 19:07:21 2017 - [debug] ok.
Sun Oct 1 19:07:21 2017 - [debug] Connecting via SSH from [email protected](192.168.56.28:22) to [email protected](192.168.56.27:22)..
Sun Oct 1 19:07:22 2017 - [debug] ok.
Sun Oct 1 19:07:22 2017 - [info] All SSH connection tests passed successfully.

測試MySQL復制的情況：
[[email protected] ~]# masterha_check_repl --conf=/masterha_work/conf/mha_total.cnf
Fri Oct 6 13:28:22 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Fri Oct 6 13:28:22 2017 - [info] Reading application default configuration from /masterha_work/conf/mha_total.cnf..
Fri Oct 6 13:28:22 2017 - [info] Reading server configuration from /masterha_work/conf/mha_total.cnf..
Fri Oct 6 13:28:22 2017 - [info] MHA::MasterMonitor version 0.56.
Fri Oct 6 13:28:22 2017 - [info] GTID failover mode = 0
Fri Oct 6 13:28:22 2017 - [info] Dead Servers:
Fri Oct 6 13:28:22 2017 - [info] Alive Servers:
Fri Oct 6 13:28:22 2017 - [info] 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 13:28:22 2017 - [info] 192.168.56.27(192.168.56.27:3307)
Fri Oct 6 13:28:22 2017 - [info] 192.168.56.28(192.168.56.28:3307)
Fri Oct 6 13:28:22 2017 - [info] Alive Slaves:
Fri Oct 6 13:28:22 2017 - [info] 192.168.56.27(192.168.56.27:3307) Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Fri Oct 6 13:28:22 2017 - [info] Replicating from 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 13:28:22 2017 - [info] Primary candidate for the new Master (candidate_master is set)
Fri Oct 6 13:28:22 2017 - [info] 192.168.56.28(192.168.56.28:3307) Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Fri Oct 6 13:28:22 2017 - [info] Replicating from 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 13:28:22 2017 - [info] Not candidate for the new Master (no_master is set)
Fri Oct 6 13:28:22 2017 - [info] Current Alive Master: 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 13:28:22 2017 - [info] Checking slave configurations..
Fri Oct 6 13:28:22 2017 - [info] read_only=1 is not set on slave 192.168.56.27(192.168.56.27:3307).
Fri Oct 6 13:28:22 2017 - [warning] relay_log_purge=0 is not set on slave 192.168.56.27(192.168.56.27:3307).
Fri Oct 6 13:28:22 2017 - [info] read_only=1 is not set on slave 192.168.56.28(192.168.56.28:3307).
Fri Oct 6 13:28:22 2017 - [warning] relay_log_purge=0 is not set on slave 192.168.56.28(192.168.56.28:3307).
Fri Oct 6 13:28:22 2017 - [info] Checking replication filtering settings..
Fri Oct 6 13:28:22 2017 - [info] binlog_do_db= , binlog_ignore_db=
Fri Oct 6 13:28:22 2017 - [info] Replication filtering check ok.
Fri Oct 6 13:28:22 2017 - [info] GTID (with auto-pos) is not supported
Fri Oct 6 13:28:22 2017 - [info] Starting SSH connection tests..
Fri Oct 6 13:28:25 2017 - [info] All SSH connection tests passed successfully.
Fri Oct 6 13:28:25 2017 - [info] Checking MHA Node version..
Fri Oct 6 13:28:25 2017 - [info] Version check ok.
Fri Oct 6 13:28:25 2017 - [info] Checking SSH publickey authentication settings on the current master..
Fri Oct 6 13:28:25 2017 - [info] HealthCheck: SSH to 192.168.56.26 is reachable.
Fri Oct 6 13:28:26 2017 - [info] Master MHA Node version is 0.56.
Fri Oct 6 13:28:26 2017 - [info] Checking recovery script configurations on 192.168.56.26(192.168.56.26:3307)..
Fri Oct 6 13:28:26 2017 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysql/3307/logs --output_file=/masterha_work/rmt_mysql_binlog_workdir/save_binary_logs_test --manager_version=0.56 --start_file=mysql-bin.000003
Fri Oct 6 13:28:26 2017 - [info] Connecting to [email protected](192.168.56.26:22)..
Creating /masterha_work/rmt_mysql_binlog_workdir if not exists.. ok.
Checking output directory is accessible or not..
ok.
Binlog found at /data/mysql/3307/logs, up to mysql-bin.000003
Fri Oct 6 13:28:26 2017 - [info] Binlog setting check done.
Fri Oct 6 13:28:26 2017 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Fri Oct 6 13:28:26 2017 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user=‘mhauser‘ --slave_host=192.168.56.27 --slave_ip=192.168.56.27 --slave_port=3307 --workdir=/masterha_work/rmt_mysql_binlog_workdir --target_version=5.6.34-log --manager_version=0.56 --relay_log_info=/data/mysql/3307/data/relay-log.info --relay_dir=/data/mysql/3307/data/ --slave_pass=xxx
Fri Oct 6 13:28:26 2017 - [info] Connecting to [email protected](192.168.56.27:22)..
Checking slave recovery environment settings..
Opening /data/mysql/3307/data/relay-log.info ... ok.
Relay log found at /data/mysql/3307/data, up to relay-bin.000002
Temporary relay log file is /data/mysql/3307/data/relay-bin.000002
Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Fri Oct 6 13:28:26 2017 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user=‘mhauser‘ --slave_host=192.168.56.28 --slave_ip=192.168.56.28 --slave_port=3307 --workdir=/masterha_work/rmt_mysql_binlog_workdir --target_version=5.6.34-log --manager_version=0.56 --relay_log_info=/data/mysql/3307/data/relay-log.info --relay_dir=/data/mysql/3307/data/ --slave_pass=xxx
Fri Oct 6 13:28:26 2017 - [info] Connecting to [email protected](192.168.56.28:22)..
Checking slave recovery environment settings..
Opening /data/mysql/3307/data/relay-log.info ... ok.
Relay log found at /data/mysql/3307/data, up to relay-bin.000002
Temporary relay log file is /data/mysql/3307/data/relay-bin.000002
Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
done.
Testing mysqlbinlog output.. done.
Cleaning up test file(s).. done.
Fri Oct 6 13:28:27 2017 - [info] Slaves settings check done.
Fri Oct 6 13:28:27 2017 - [info]
192.168.56.26(192.168.56.26:3307) (current master)
+--192.168.56.27(192.168.56.27:3307)
+--192.168.56.28(192.168.56.28:3307)

Fri Oct 6 13:28:27 2017 - [info] Checking replication health on 192.168.56.27..
Fri Oct 6 13:28:27 2017 - [info] ok.
Fri Oct 6 13:28:27 2017 - [info] Checking replication health on 192.168.56.28..
Fri Oct 6 13:28:27 2017 - [info] ok.
Fri Oct 6 13:28:27 2017 - [warning] master_ip_failover_script is not defined.
Fri Oct 6 13:28:27 2017 - [warning] shutdown_script is not defined.
Fri Oct 6 13:28:27 2017 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.

MHA 一主兩從搭建

ring ssh-key set fault 配置 remote change use cat 環境介紹：主機名 IP MHA角色 MySQL角色node1 192.168.56.26 Node MySQL Master

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