如何進行zabbix資料庫優化?
MySQL版本推薦
MySQL5.7及以上版本,便捷的線上DDL方便zabbix的快速升級 連結資料庫方式:zabbix的server、proxy、MySQL資料庫儘量使用域名方式連線,方便進行故障切換。
zabbix資料庫的授權
讀寫許可權,用作zabbix自身訪問:
grant all privileges on zabbix. to 'zabbix'@'1.1.1.1' identified by 'zabbix';
只讀許可權,用作二次開發只讀zabbix資料庫:
grant SELECT on zabbix. to 'zabbix_ro'@'1.1.1.1' identified by 'zabbixro';
MySQL配置檔案需要調整的幾個重要引數
innodb_log_files_in_group = 16
innodb_log_file_size = 1G
innodb_file_per_table = 1
max_allowed_packet = 64M
back_log = 1024
max-connections = 2000
sync_binlog = 0
innodb_flush_log_at_trx_commit = 0
binlog_format = row
expire_logs_days = 3
巧用SQL語句運維zabbix
使用SQL語句更新監控項或是觸發器,提升變更效率,減少對資料庫影響:
update zabbix.items set delay=5 where key='icmpping';
update zabbix.items t,zabbix.functions f set f.parameter='30' where f.itemid=t.itemid and t.key='agent.ping'
巧用讀寫分離和負載均衡
在做二次開發時,為避免對線上監控server端的影響,儘量使用獨立的資料庫從庫讀取資料(可能有大量通過API讀取歷史資料庫等只讀操作),需要一個只讀的api介面,此時需要做zabbix資料庫讀寫分離,可以在從庫上過濾掉幾張表,開啟從庫的寫許可權,這幾張表主要用作使用者登入的審計、session的記錄,否則可能登入失敗,:
replicate-wild-ignore-table =zabbix.auditlog
replicate-wild-ignore-table =zabbix.sessions
replicate-wild-ignore-table =zabbix.ids
同時zabbix web_api做負載均衡的時候,請使用IP hash的方式,因為涉及到session的問題。
zabbix升級注意事項
做zabbix的升級,其實是做zabbix資料庫庫表的變更,可能包含表結構的表更、索引的變更、資料的重組等操作,此時需要做一套新的資料庫叢集作為線上叢集的存庫存在,等資料同步完成,斷掉同步,使用新的zabbix server程式連線新的資料庫叢集完成升級,升級完成後切換線上zabbix server、資料庫域名到新的server和新的資料庫上,這樣能最低限度影響正常的監控。
資料庫備份和資料清理
備份主要資訊即可,監控資料和審計日誌、events不需要備份,資料量太大。歷史資料的刪除:包含監控歷史詳情資料和趨勢資料,使用分割槽的方式進行刪除;另外events表也要定時的清理,使用主鍵進行清理,保留5天左右的即可,並需要定期的進行碎片整理,否則監控大屏顯示會逐步變慢。
zabbix server歷史資料和趨勢資料分割槽
分割槽sql指令碼下載地址:https://www.zabbix.org/wiki/Docs/howto/mysql_partition 為歷史表分割槽做準備。zabbix2.0/3.0 only,3.2以上的版本不需要執行
ALTER TABLE history_text DROP PRIMARY KEY, ADD INDEX (id), DROP INDEX history_text_2, ADD INDEX history_text_2 (itemid, id);
ALTER TABLE history_log DROP PRIMARY KEY, ADD INDEX (id), DROP INDEX history_log_2, ADD INDEX history_log_2 (itemid, id);
在server的配置檔案中設定HousekeepingFrequency=0,禁用zabbix自帶的清理歷史資料任務 設定歷史監控資料表中的時間欄位為索引,方便後續按照時間取值二次開發
ALTER TABLE history ADD INDEX clock (clock);
ALTER TABLE history_log ADD INDEX clock (clock);
ALTER TABLE history_str ADD INDEX clock (clock);
ALTER TABLE history_str_sync ADD INDEX clock (clock);
ALTER TABLE history_sync ADD INDEX clock (clock);
ALTER TABLE history_text ADD INDEX clock (clock);
ALTER TABLE history_uint ADD INDEX clock (clock);
ALTER TABLE history_uint_sync ADD INDEX clock (clock);
ALTER TABLE trends ADD INDEX clock (clock);
ALTER TABLE trends_uint ADD INDEX clock (clock);
ALTER TABLE EVENTS ADD INDEX objectid (objectid,VALUE,clock);
如果存在這五個儲存過程則刪除
DROP PROCEDURE IF EXISTS partition_create;
DROP PROCEDURE IF EXISTS partition_drop;
DROP PROCEDURE IF EXISTS partition_maintenance;
DROP PROCEDURE IF EXISTS partition_maintenance_all;
DROP PROCEDURE IF EXISTS partition_verify;
第一次執行儲存過程
CALL partition_maintenance_all('zabbix');
inser to crontab 每天執行一次儲存過程,生成新的分割槽和刪除老的分割槽
#!/bin/sh
/xxxxx/mysql/bin/mysql -uzabbix -pzabbixmonitor --socket=/xxxx/mysql/tmp/mysql.sock --database=zabbix -e "CALL partition_maintenance_all('zabbix');"
儲存過程詳情如下:
/ partition_create /
DELIMITER $$
CREATE PROCEDURE partition_create(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64), PARTITIONNAME VARCHAR(64), CLOCK INT)
BEGIN
/
SCHEMANAME = The DB schema in which to make changes
TABLENAME = The table with partitions to potentially delete
PARTITIONNAME = The name of the partition to create
/
/
Verify that the partition does not already exist
/
DECLARE RETROWS INT;
SELECT COUNT(1) INTO RETROWS
FROM information_schema.partitions
WHERE table_schema = SCHEMANAME AND TABLE_NAME = TABLENAME AND partition_description >= CLOCK;
IF RETROWS = 0 THEN
/*
1. Print a message indicating that a partition was created.
2. Create the SQL to create the partition.
3. Execute the SQL from #2.
*/
SELECT CONCAT( "partition_create(", SCHEMANAME, ",", TABLENAME, ",", PARTITIONNAME, ",", CLOCK, ")" ) AS msg;
SET @SQL = CONCAT( 'ALTER TABLE ', SCHEMANAME, '.', TABLENAME, ' ADD PARTITION (PARTITION ', PARTITIONNAME, ' VALUES LESS THAN (', CLOCK, '));' );
PREPARE STMT FROM @SQL;
EXECUTE STMT;
DEALLOCATE PREPARE STMT;
END IF;
END$$
DELIMITER ;
/ partition_drop /
DELIMITER $$
CREATE PROCEDURE partition_drop(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64), DELETE_BELOW_PARTITION_DATE BIGINT)
BEGIN
/
SCHEMANAME = The DB schema in which to make changes
TABLENAME = The table with partitions to potentially delete
DELETE_BELOW_PARTITION_DATE = Delete any partitions with names that are dates older than this one (yyyy-mm-dd)
/
DECLARE done INT DEFAULT FALSE;
DECLARE drop_part_name VARCHAR(16);
/*
Get a list of all the partitions that are older than the date
in DELETE_BELOW_PARTITION_DATE. All partitions are prefixed with
a "p", so use SUBSTRING TO get rid of that character.
*/
DECLARE myCursor CURSOR FOR
SELECT partition_name
FROM information_schema.partitions
WHERE table_schema = SCHEMANAME AND TABLE_NAME = TABLENAME AND CAST(SUBSTRING(partition_name FROM 2) AS UNSIGNED) < DELETE_BELOW_PARTITION_DATE;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
/*
Create the basics for when we need to drop the partition. Also, create
@drop_partitions to hold a comma-delimited list of all partitions that
should be deleted.
*/
SET @alter_header = CONCAT("ALTER TABLE ", SCHEMANAME, ".", TABLENAME, " DROP PARTITION ");
SET @drop_partitions = "";
/*
Start looping through all the partitions that are too old.
*/
OPEN myCursor;
read_loop: LOOP
FETCH myCursor INTO drop_part_name;
IF done THEN
LEAVE read_loop;
END IF;
SET @drop_partitions = IF(@drop_partitions = "", drop_part_name, CONCAT(@drop_partitions, ",", drop_part_name));
END LOOP;
IF @drop_partitions != "" THEN
/*
1. Build the SQL to drop all the necessary partitions.
2. Run the SQL to drop the partitions.
3. Print out the table partitions that were deleted.
*/
SET @full_sql = CONCAT(@alter_header, @drop_partitions, ";");
PREPARE STMT FROM @full_sql;
EXECUTE STMT;
DEALLOCATE PREPARE STMT;
SELECT CONCAT(SCHEMANAME, ".", TABLENAME) AS `table`, @drop_partitions AS `partitions_deleted`;
ELSE
/*
No partitions are being deleted, so print out "N/A" (Not applicable) to indicate
that no changes were made.
*/
SELECT CONCAT(SCHEMANAME, ".", TABLENAME) AS `table`, "N/A" AS `partitions_deleted`;
END IF;
END$$
DELIMITER ;
/ partition_maintenance /
DELIMITER $$
CREATE PROCEDURE partition_maintenance(SCHEMA_NAME VARCHAR(32), TABLE_NAME VARCHAR(32), KEEP_DATA_DAYS INT, HOURLY_INTERVAL INT, CREATE_NEXT_INTERVALS INT)
BEGIN
DECLARE OLDER_THAN_PARTITION_DATE VARCHAR(16);
DECLARE PARTITION_NAME VARCHAR(16);
DECLARE LESS_THAN_TIMESTAMP INT;
DECLARE CUR_TIME INT;
CALL partition_verify(SCHEMA_NAME, TABLE_NAME, HOURLY_INTERVAL);
SET CUR_TIME = UNIX_TIMESTAMP(DATE_FORMAT(NOW(), '%Y-%m-%d 00:00:00'));
SET @__interval = 1;
create_loop: LOOP
IF @__interval > CREATE_NEXT_INTERVALS THEN
LEAVE create_loop;
END IF;
SET LESS_THAN_TIMESTAMP = CUR_TIME + (HOURLY_INTERVAL * @__interval * 3600);
SET PARTITION_NAME = FROM_UNIXTIME(CUR_TIME + HOURLY_INTERVAL * (@__interval - 1) * 3600, 'p%Y%m%d%H00');
CALL partition_create(SCHEMA_NAME, TABLE_NAME, PARTITION_NAME, LESS_THAN_TIMESTAMP);
SET @__interval=@__interval+1;
END LOOP;
SET OLDER_THAN_PARTITION_DATE=DATE_FORMAT(DATE_SUB(NOW(), INTERVAL KEEP_DATA_DAYS DAY), '%Y%m%d0000');
CALL partition_drop(SCHEMA_NAME, TABLE_NAME, OLDER_THAN_PARTITION_DATE);
END$$
DELIMITER ;
/ partition_verify /
DELIMITER $$
CREATE PROCEDURE partition_verify(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64), HOURLYINTERVAL INT(11))
BEGIN
DECLARE PARTITION_NAME VARCHAR(16);
DECLARE RETROWS INT(11);
DECLARE FUTURE_TIMESTAMP TIMESTAMP;
/*
* Check if any partitions exist for the given SCHEMANAME.TABLENAME.
*/
SELECT COUNT(1) INTO RETROWS
FROM information_schema.partitions
WHERE table_schema = SCHEMANAME AND TABLE_NAME = TABLENAME AND partition_name IS NULL;
/*
* If partitions do not exist, go ahead and partition the table
*/
IF RETROWS = 1 THEN
/*
* Take the current date at 00:00:00 and add HOURLYINTERVAL to it. This is the timestamp below which we will store values.
* We begin partitioning based on the beginning of a day. This is because we don't want to generate a random partition
* that won't necessarily fall in line with the desired partition naming (ie: if the hour interval is 24 hours, we could
* end up creating a partition now named "p201403270600" when all other partitions will be like "p201403280000").
*/
SET FUTURE_TIMESTAMP = TIMESTAMPADD(HOUR, HOURLYINTERVAL, CONCAT(CURDATE(), " ", '00:00:00'));
SET PARTITION_NAME = DATE_FORMAT(CURDATE(), 'p%Y%m%d%H00');
-- Create the partitioning query
SET @__PARTITION_SQL = CONCAT("ALTER TABLE ", SCHEMANAME, ".", TABLENAME, " PARTITION BY RANGE(`clock`)");
SET @__PARTITION_SQL = CONCAT(@__PARTITION_SQL, "(PARTITION ", PARTITION_NAME, " VALUES LESS THAN (", UNIX_TIMESTAMP(FUTURE_TIMESTAMP), "));");
-- Run the partitioning query
PREPARE STMT FROM @__PARTITION_SQL;
EXECUTE STMT;
DEALLOCATE PREPARE STMT;
END IF;
END$$
DELIMITER ;
/ partition_maintenance_all /
DELIMITER $$
CREATE PROCEDURE partition_maintenance_all(SCHEMA_NAME VARCHAR(32))
BEGIN
CALL partition_maintenance(SCHEMA_NAME, 'history', 28, 24, 14);
CALL partition_maintenance(SCHEMA_NAME, 'history_log', 28, 24, 14);
CALL partition_maintenance(SCHEMA_NAME, 'history_str', 28, 24, 14);
CALL partition_maintenance(SCHEMA_NAME, 'history_text', 28, 24, 14);
CALL partition_maintenance(SCHEMA_NAME, 'history_uint', 28, 24, 14);
CALL partition_maintenance(SCHEMA_NAME, 'trends', 730, 24, 14);
CALL partition_maintenance(SCHEMA_NAME, 'trends_uint', 730, 24, 14);
END$$
DELIMITER ;
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