MariaDB安装

二进制安装

(CentOS7 + MariaDB 10.2.8)

安装前准备

1. 关闭NUMA

numctl -interleave=all /path/mysqdd --defaults-file=/path/my.cnf
https://access.redhat.com/solutions/23216

2. 检查NUMA

numactl --show
numactl --hardware

限制设置

ulimit -a查看
主要查看open files，max user processes的限制设置。
open files系统打开文件过多，会报 OS error code 24: Too many open files的错误。

直接修改/etc/security/limits.conf文件，需重启OS生效。
vim /etc/security/limits.conf

*               soft    nproc           65535
*               hard    nproc           65535
*               soft    nofile          65535
*               hard    nofile          65535

3. Swap

原则：要么不分配，要么最多分配4GB
查看：
sysctl -a | grep vm.swappiness

临时性修改（等号两边没有空格）：

sysctl vm.swappiness=0
sysctl -p

永久修改（需重启OS生效）：

vim /etc/sysctl.conf
vm.swappiness=0

如果没有，在最后添加一行。

4. CPU

关闭硬件的节能模式，开启高性能模式

5. 文件系统

建议XFS
mysql数据库所在/data目录单独一个挂载分区

6. SELinux & iptables

临时性关闭SELinux

setenforce 0

永久关闭

vim /etc/sysconfig/selinux
SELINUX=disabled

临时性关闭iptables

service iptables stop

永久关闭

chkconfig --del iptables

如果是CentOS 7下关闭firewall

systemctl stop firewall
systemctl disable firewall

7. IO调度

raid

正式安装

1. 创建账号

groupadd mysql

运行的mysql账号不能登录linux

useradd -g mysql -d /usr/local/mysql -s /sbin/nologin -M mysql
id mysql

2. 基本软件安装

mkdir -p /opt/mysql
cd /opt/mysql
wget https://mirrors.tuna.tsinghua.edu.cn/mariadb//mariadb-10.2.8/bintar-linux-x86_64/mariadb-10.2.8-linux-x86_64.tar.gz
tar -zxvf mariadb-10.2.8-linux-x86_64.tar.gz 
cd /usr/local/
ln -s /opt/mysql/mariadb-10.2.8-linux-x86_64 mysql
chown -R mysql:mysql mysql mysql/

3. 数据库相关的目录

mkdir -p /data/mysql/mysql3306/{data,log,tmp}
cd /data/
chown -R mysql:mysql mysql

配置文件：/etc/my.cnf
以下为4G内存，4核逻辑CPU的my.cnf参考，需要根据生产实际情况而调整：

[client]
port = 3306
socket = /data/mysql/mysql3306/tmp/mysql3306.sock
default-character-set = utf8mb4

[mysql]
auto-rehash
prompt = "\\u@\\h [\\d]"
default-character-set = utf8mb4

[mysqld]
user = mysql
port = 3306
socket = /data/mysql/mysql3306/tmp/mysql3306.sock
basedir = /usr/local/mysql
datadir = /data/mysql/mysql3306/data
tmpdir = /data/mysql/mysql3306/tmp

#character set
character-set-server = utf8mb4
open_files_limit = 65535
max_connections = 200
max_connect_errors = 100000

#logs
log-error = /data/mysql/mysql3306/log/error.log
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /data/mysql/mysql3306/log/slow.log

#binlog
log-bin = /data/mysql/mysql3306/log/mysql-bin
binlog_format = row
binlog_cache_size = 4M
max_binlog_cache_size = 1000M
max_binlog_size = 500M
sync_binlog = 1
expire_logs_days = 7

#replication
#server-id format: port of mysql + last two segments of ip
server-id = 3306137244
relay_log = /data/mysql/mysql3306/log/relay-bin
log_slave_updates = 1

#innodb
innodb_data_file_path = ibdata1:1G:autoextend
innodb_buffer_pool_size = 2560M
innodb_buffer_pool_instances = 8
innodb_flush_log_at_trx_commit = 1
innodb_flush_method = O_DIRECT
innodb_file_per_table = 1
innodb_io_capacity = 2000
innodb_max_dirty_pages_pct = 50
innodb_log_file_size = 1G
innodb_log_buffer_size = 32M
innodb_rollback_on_timeout = 1
innodb_status_file = 1
#transaction_isolation = READ-COMMITTED

#buffer & cache
table_open_cache = 2048
table_definition_cache = 2048
max_heap_table_size = 32M
sort_buffer_size = 4M
join_buffer_size = 4M
thread_cache_size = 100
query_cache_size = 0
query_cache_type = 0
query_cache_min_res_unit = 512
thread_stack = 512K
tmp_table_size = 96M
key_buffer_size = 32M
read_buffer_size = 8M
read_rnd_buffer_size = 8M
bulk_insert_buffer_size = 64M

#time
default-time-zone = '+08:00'

[mysqldump]
quick
max_allowed_packet = 128M

[myisamchk]
key_buffer_size = 16M
sort_buffer_size = 32M

4. 初始化

cd /usr/local/mysql
./scripts/mysql_install_db  --user=mysql

如果不是配置文件不是默认目录，指定一下。(--defaults-file=/etc/my.cnf必须是第一个参数)

./scripts/mysql_install_db   --defaults-file=/etc/my3307.cnf   --user=mysql

注意：一定要用相对路径来安装，否则会报：FATAL ERROR: Could not find ./bin/my_print_defaults的错误。

5. 启动

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

或

service mysql start

如果要加入系统自动启动（生产环境一般不会设置自动启动）

chkconfig --add mysql

官网有提到使用以下启动方式： (https://mariadb.com/kb/en/the-mariadb-library/installing-mariadb-binary-tarballs)

/usr/local/mysql/bin/mysqld --defaults-file=/etc/my.cnf &

不能使用service msyql stop的方法来关闭，可使用/etc/init.d/mysql stop或mysqladmin -uroot -p shutdown或kill 进程来关闭（KILL的方式不推荐）

6. 连接mysql

如果在shell下输入mysql显示command not found 是环境变量没有设置好。

echo 'export PATH=$PATH:/usr/local/mysql/bin' >>/etc/profile
source /etc/profile

在本机使用socket文件连接

mysql -S /data/mysql/mysql3306/tmp/mysql3306.sock -uroot -p

使用TCP/IP连接

mysql -uroot -p -h127.0.0.1

1. 安全加固

ALTER USER 'root'@'localhost' IDENTIFIED BY 'my_password';
DELETE FROM mysql.user WHERE user = '';
FLUSH PRIVILEGES;
DROP DATABASE IF EXISTS `test`;

1. 关闭mysql

/etc/init.d/mysql stop

或

service mysql stop