技术分享 | 将GreatSQL添加到系统systemd服务
2021/12/31 19:16:06
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1、关于systemd
systemd 是Linux系统启动和服务器守护进程管理器,负责在系统启动或运行时,激活系统资源,服务器进程和其它进程,systemd被设计用来改进原来sysvinit中的多个缺点。
CentOS 7的systemd服务程序脚本存放在 /usr/lib/systemd/目录下,并区分 system 和 user,每一个服务程序脚本以 .service 结尾,例如 /usr/lib/systemd/system/sshd.service。
2、编辑systemd服务程序脚本
设定 GreatSQL 二进制文件放在 /usr/local/GreatSQL-8.0.23-14/ 目录下,即设定 basedir 为此目录,先进入到这个工作目录中。
[root@greatsql~]# cd /usr/local/GreatSQL-8.0.23-14/
复制 support-files/greatsql.server 程序脚本到 /usr/lib/systemd/system/ 目录下:
[root@greatsql~]# cp -f ./support-files/greatsql.server /usr/lib/systemd/system/
该脚本内容如下,基本上不需要再修改什么内容:
[root@greatsql~]# cat /usr/lib/systemd/system/greatsql.service [Unit] Description=GreatSQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql Type=notify TimeoutSec=0 PermissionsStartOnly=true ExecStartPre=/usr/local/GreatSQL-8.0.23-14/bin/mysqld_pre_systemd ExecStart=/usr/local/GreatSQL-8.0.23-14/bin/mysqld $MYSQLD_OPTS EnvironmentFile=-/etc/sysconfig/mysql LimitNOFILE = 10000 Restart=on-failure RestartPreventExitStatus=1 Environment=MYSQLD_PARENT_PID=1 PrivateTmp=false
3、准备my.cnf及其他配置文件
复制 support-files/my.cnf 到 /etc/ 目录下,替换原来的配置文件(原来的 /etc/my.cnf 建议先备份),并确认 datadir、port、server_id 等参数是否要修改:
[root@greatsql~]# cp -f ./support-files/my.cnf /etc/my.cnf [root@greatsql~]# cat /etc/my.cnf #my.cnf [mysqld] user = mysql port = 3306 server_id = 3306 basedir=/usr/local/GreatSQL-8.0.23-14 datadir = /data/GreatSQL socket = /data/GreatSQL/mysql.sock pid-file = mysql.pid character-set-server = UTF8MB4 skip_name_resolve = 1 #若你的MySQL数据库主要运行在境外,请务必根据实际情况调整本参数 default_time_zone = "+8:00" #performance setttings lock_wait_timeout = 3600 open_files_limit = 65535 back_log = 1024 max_connections = 512 max_connect_errors = 1000000 table_open_cache = 1024 table_definition_cache = 1024 thread_stack = 512K sort_buffer_size = 4M join_buffer_size = 4M read_buffer_size = 8M read_rnd_buffer_size = 4M bulk_insert_buffer_size = 64M thread_cache_size = 768 interactive_timeout = 600 wait_timeout = 600 tmp_table_size = 32M max_heap_table_size = 32M #log settings log_timestamps = SYSTEM log_error = /data/GreatSQL/error.log log_error_verbosity = 3 slow_query_log = 1 log_slow_extra = 1 slow_query_log_file = /data/GreatSQL/slow.log long_query_time = 0.1 log_queries_not_using_indexes = 1 log_throttle_queries_not_using_indexes = 60 min_examined_row_limit = 100 log_slow_admin_statements = 1 log_slow_slave_statements = 1 log_bin = /data/GreatSQL/binlog binlog_format = ROW sync_binlog = 1 binlog_cache_size = 4M max_binlog_cache_size = 2G max_binlog_size = 1G binlog_rows_query_log_events = 1 binlog_expire_logs_seconds = 604800 #MySQL 8.0.22前,想启用MGR的话,需要设置binlog_checksum=NONE才行 binlog_checksum = CRC32 gtid_mode = ON enforce_gtid_consistency = TRUE #myisam settings key_buffer_size = 32M myisam_sort_buffer_size = 128M #replication settings master_info_repository = TABLE relay_log_info_repository = TABLE relay_log_recovery = 1 slave_parallel_type = LOGICAL_CLOCK #可以设置为逻辑CPU数量的2倍 slave_parallel_workers = 64 binlog_transaction_dependency_tracking = WRITESET slave_preserve_commit_order = 1 slave_checkpoint_period = 2 #mgr settings loose-plugin_load_add = 'mysql_clone.so' loose-plugin_load_add = 'group_replication.so' loose-group_replication_group_name = "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaa1" #MGR本地节点IP:PORT,请自行替换 loose-group_replication_local_address = "172.16.16.10:33061" #MGR集群所有节点IP:PORT,请自行替换 loose-group_replication_group_seeds = "172.16.16.10:33061,172.16.16.11:33061,172.16.16.12:33061" loose-group_replication_start_on_boot = OFF loose-group_replication_bootstrap_group = OFF loose-group_replication_exit_state_action = READ_ONLY loose-group_replication_flow_control_mode = "DISABLED" loose-group_replication_single_primary_mode = ON #innodb settings transaction_isolation = REPEATABLE-READ innodb_buffer_pool_size = 2G innodb_buffer_pool_instances = 8 innodb_data_file_path = ibdata1:12M:autoextend innodb_flush_log_at_trx_commit = 1 innodb_log_buffer_size = 32M innodb_log_file_size = 1G innodb_log_files_in_group = 3 innodb_max_undo_log_size = 4G # 根据您的服务器IOPS能力适当调整 # 一般配普通SSD盘的话,可以调整到 10000 - 20000 # 配置高端PCIe SSD卡的话,则可以调整的更高,比如 50000 - 80000 innodb_io_capacity = 4000 innodb_io_capacity_max = 8000 innodb_open_files = 65535 innodb_flush_method = O_DIRECT innodb_lru_scan_depth = 4000 innodb_lock_wait_timeout = 10 innodb_rollback_on_timeout = 1 innodb_print_all_deadlocks = 1 innodb_online_alter_log_max_size = 4G innodb_print_ddl_logs = 1 innodb_status_file = 1 #注意: 开启 innodb_status_output & innodb_status_output_locks 后, 可能会导致log_error文件增长较快 innodb_status_output = 0 innodb_status_output_locks = 1 innodb_sort_buffer_size = 67108864 #innodb monitor settings innodb_monitor_enable = "module_innodb" innodb_monitor_enable = "module_server" innodb_monitor_enable = "module_dml" innodb_monitor_enable = "module_ddl" innodb_monitor_enable = "module_trx" innodb_monitor_enable = "module_os" innodb_monitor_enable = "module_purge" innodb_monitor_enable = "module_log" innodb_monitor_enable = "module_lock" innodb_monitor_enable = "module_buffer" innodb_monitor_enable = "module_index" innodb_monitor_enable = "module_ibuf_system" innodb_monitor_enable = "module_buffer_page" innodb_monitor_enable = "module_adaptive_hash" #pfs settings performance_schema = 1 #performance_schema_instrument = '%memory%=on' performance_schema_instrument = '%lock%=on'
再复制 support-files/sysconfig/mysql 文件到 /etc/sysconfig 目录下。
[root@greatsql~]# cp -f ./support-files/sysconfig/mysql /etc/sysconfig/mysql [root@greatsql~]# cat /etc/sysconfig/mysql LD_PRELOAD=/usr/lib64/libjemalloc.so.1
这是为了能让GreatSQL启动时加载jemalloc,获得更好的内存管理性能。
4、启动GreatSQL服务
上述准备工作完成后,还要将 GreatSQL 服务正式加载到 systemd 列表中:
[root@greatsql~]# systemctl daemon-reload
这就会自动将GreatSQL这个新服务加载进来了。
然后开始启动服务:
[root@greatsql~]# systemctl start greatsql #如果加上 .service 后缀也可以,例如 [root@greatsql~]# systemctl start greatsql.service
如果启动失败,可能会输出类似的报错提示:
[root@greatsql~]# systemctl start greatsql Job for greatsql.service failed because the control process exited with error code. See "systemctl status greatsql.service" and "journalctl -xe" for details.
按照错误提示,执行 systemctl status greatsql.service 或 journalctl -xe 查看失败的原因,亦可查看系统日志 /var/log/messages 或 GreatSQL日志 /data/GreatSQL/error.log 确认失败原因。
第一次会比较慢,因为还要初始化InnoDB系统表空间、redo、undo日志等。初始化时,还会为root生成临时密码,例如这样:
... [MY-010454] [Server] A temporary password is generated for root@localhost: dofI,0HE#E>C ...
首次登入需要用这个密码,并立即修改成新密码,新密码还必须符合安全规范才行,不能是弱密码:
# 先登入 [root@greatsql~]# mysql -uroot -p -S/data/GreatSQL/mysql.sock Enter password: ************ # 而后修改密码,否则不能做其他操作 [root@GreatSQL][(none)]> ALTER USER CURRENT_USER() IDENTIFIED BY 'GreatSQL3##)^';
这是因为用默认加载了 validate_password 组件(component),对密码有合规性要求。
[root@GreatSQL][(none)]> SELECT * FROM mysql.component; +--------------+--------------------+------------------------------------+ | component_id | component_group_id | component_urn | +--------------+--------------------+------------------------------------+ | 1 | 1 | file://component_validate_password | +--------------+--------------------+------------------------------------+
如果嫌麻烦可以卸载掉(但非常不建议这么做):
[root@GreatSQL][(none)]> UNINSTALL COMPONENT 'file://component_validate_password';
最后,介绍systemctl主要几个的命令:
-
重载系统服务:systemctl daemon-reload
-
启用开机启动:systemctl enable greatsql
-
禁用开机启动:systemctl disable greatsql
-
启动服务:systemctl start greatsql
-
停止服务:systemctl stop greatsql
-
重启服务:systemctl restart greatsql
-
查看服务状态:systemctl status greatsql
全文完。
Enjoy GreatSQL
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