通過(guò)Python收集匯聚MySQL 表信息的實(shí)例詳解
發(fā)布日期：2021-12-20 13:10 | 文章來(lái)源：源碼之家
一.需求
統(tǒng)計(jì)收集各個(gè)實(shí)例上table的信息，主要是表的記錄數(shù)及大小。
收集的范圍是cmdb中所有的數(shù)據(jù)庫(kù)實(shí)例。
二.公共基礎(chǔ)文件說(shuō)明
1.配置文件
配置文為db_servers_conf.ini，假設(shè)cmdb的DBServer為119.119.119.119，單獨(dú)存放收集監(jiān)控?cái)?shù)據(jù)的DBserver為110.110.110.110. 這兩個(gè)DB實(shí)例的訪問(wèn)用戶(hù)名一樣，定義在了[uid_mysql] 部分，需要去收集的各個(gè)DB實(shí)例，用到的賬號(hào)密碼是另一個(gè)，定義在了[collector_mysql]部分。
[uid_mysql] dbuid = 用*戶(hù)*名 dbuid_p_w_d = 相*應(yīng)*密*碼 [cmdb_server] db_host = 119.119.119.119 db_port = 3306 [dbmonitor_server] db_host = 110.110.110.110 db_port = 3306 [collector_mysql] collector = DB*實(shí)*例*用*戶(hù)*名 collector_p_w_d = DB*實(shí)*例*密*碼
2.定義聲明db連接
文件為get_mysql_db_connect.py
# -*- coding: utf-8 -*-
import sys
import os
import configparser
import pymysql
# 獲取連接串信息
def mysql_get_db_connect(db_host, db_port):
db_host = db_host
db_port = db_port
db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
config = configparser.ConfigParser()
config.read(db_ps_file, encoding="utf-8")
db_user = config.get('uid_mysql', 'dbuid')
db_pwd = config.get('uid_mysql', 'dbuid_p_w_d')
conn = pymysql.connect(host=db_host, port=db_port, user=db_user, password=db_pwd, connect_timeout=5, read_timeout=5, write_timeout=5)
return conn
# 獲取連接串信息
def mysql_get_collectdb_connect(db_host, db_port):
db_host = db_host
db_port = db_port
db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
config = configparser.ConfigParser()
config.read(db_ps_file, encoding="utf-8")
db_user = config.get('collector_mysql', 'collector')
db_pwd = config.get('collector_mysql', 'collector_p_w_d')
conn = pymysql.connect(host=db_host, port=db_port, user=db_user, password=db_pwd, connect_timeout=5, read_timeout=5, write_timeout=5)
return conn
3.定義聲明訪問(wèn)db的操作
文件為mysql_exec_sql.py,注意需要導(dǎo)入上面的model。
# -*- coding: utf-8 -*- import get_mysql_db_connect def mysql_exec_dml_sql(db_host, db_port, exec_sql): conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port) with conn.cursor() as cursor_db: cursor_db.execute(exec_sql) conn.commit() ##需要顯式關(guān)閉 cursor_db.close() conn.close() def mysql_exec_select_sql(db_host, db_port, exec_sql): conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port) with conn.cursor() as cursor_db: cursor_db.execute(exec_sql) sql_rst = cursor_db.fetchall() ##顯式關(guān)閉conn cursor_db.close() conn.close() return sql_rst def mysql_exec_select_sql_include_colnames(db_host, db_port, exec_sql): conn = mysql_get_db_connect.mysql_get_db_connect(db_host, db_port) with conn.cursor() as cursor_db: cursor_db.execute(exec_sql) sql_rst = cursor_db.fetchall() col_names = cursor_db.description return sql_rst, col_names
三.主要代碼
3.1 創(chuàng)建保存數(shù)據(jù)的腳本
用來(lái)保存收集表信息的表：table_info
create table `table_info` ( `id` int(11) NOT NULL AUTO_INCREMENT, `host_ip` varchar(50) NOT NULL DEFAULT '0', `port` varchar(10) NOT NULL DEFAULT '3306', `db_name` varchar(100) NOT NULL DEFAULT ''COMMENT '數(shù)據(jù)庫(kù)名字', `table_name` varchar(100) NOT NULL DEFAULT '' COMMENT '表名字', `table_rows` bigint NOT NULL DEFAULT 0 COMMENT '表行數(shù)', `table_data_length` bigint, `table_index_length` bigint, `table_data_free` bigint, `table_auto_increment` bigint, `creator` varchar(50) NOT NULL DEFAULT '', `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, `operator` varchar(50) NOT NULL DEFAULT '', `operate_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 ;
收集過(guò)程，如果訪問(wèn)某個(gè)實(shí)例異常時(shí)，將失敗的信息保存到表 gather_error_info 中，以便跟蹤分析。
create table `gather_error_info` ( `id` int(11) NOT NULL AUTO_INCREMENT, `app_name` varchar(150) NOT NULL DEFAULT '報(bào)錯(cuò)的程序', `host_ip` varchar(50) NOT NULL DEFAULT '0', `port` varchar(10) NOT NULL DEFAULT '3306', `db_name` varchar(60) NOT NULL DEFAULT '0' COMMENT '數(shù)據(jù)庫(kù)名字', `error_msg` varchar(500) NOT NULL DEFAULT '報(bào)錯(cuò)的程序', `status` int(11) NOT NULL DEFAULT '2', `creator` varchar(50) NOT NULL DEFAULT '', `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, `operator` varchar(50) NOT NULL DEFAULT '', `operate_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;
3.2 收集的功能腳本
定義收集 DB_info的腳本collect_tables_info.py
# -*- coding: utf-8 -*-
import sys
import os
import datetime
import configparser
import pymysql
import mysql_get_db_connect
import mysql_exec_sql
import mysql_collect_exec_sql
import pandas as pd
def collect_tables_info():
db_ps_file = os.path.join(sys.path[0], "db_servers_conf.ini")
config = configparser.ConfigParser()
config.read(db_ps_file, encoding="utf-8")
cmdb_host = config.get('cmdb_server', 'db_host')
cmdb_port = config.getint('cmdb_server', 'db_port')
monitor_db_host = config.get('dbmonitor_server', 'db_host')
monitor_db_port = config.getint('dbmonitor_server', 'db_port')
# 獲取需要遍歷的DB列表
exec_sql_1 = """
select vm_ip_address,port,b.vm_host_name,remark
FROM cmdbdb.mysqldb_instance
;
"""
exec_sql_tablesizeinfo = """
select TABLE_SCHEMA,table_name,table_rows,data_length ,index_length,data_free,auto_increment
from information_schema.tables
where TABLE_SCHEMA not in ('mysql','information_schema','performance_schema','sys')
and TABLE_TYPE ='BASE TABLE';
"""
exec_sql_insert_tablesize = " insert into monitordb.table_info (host_ip,port,db_name,table_name,table_rows,table_data_length,table_index_length,table_data_free,table_auto_increment) \
VALUES ('%s', '%s','%s','%s', %s ,%s, %s,%s, %s) ;"
exec_sql_error = " insert into monitordb.gather_db_error (app_name,host_ip,port,error_msg) \
VALUES ('%s', '%s','%s','%s') ;"
sql_rst_1 = mysql_exec_sql.mysql_exec_select_sql(cmdb_host, cmdb_port, exec_sql_1)
if len(sql_rst_1):
for i in range(len(sql_rst_1)):
rw_host = list(sql_rst_1[i])
db_host_ip = rw_host[0]
db_port_s = rw_host[1]
##print(type(rw_host))
###ValueError: port should be of type int
db_port = int(db_port_s)
try:
sql_rst_tablesize = mysql_collect_exec_sql.mysql_exec_select_sql(db_host_ip, db_port, exec_sql_tablesizeinfo)
##print(sql_rst_tablesize)
if len(sql_rst_tablesize):
for i in range(len(sql_rst_tablesize)):
rw_tableinfo = list(sql_rst_tablesize[i])
rw_db_name = rw_tableinfo[0]
rw_table_name = rw_tableinfo[1]
rw_table_rows = rw_tableinfo[2]
rw_data_length = rw_tableinfo[3]
rw_index_length = rw_tableinfo[4]
rw_data_free = rw_tableinfo[5]
rw_auto_increment = rw_tableinfo[6]
##print(rw_auto_increment)
##Python中對(duì)變量是否為None的判斷
if rw_auto_increment is None: rw_auto_increment = 0
###一定要有一個(gè)exec_sql_insert_table_com，如果是exec_sql_insert_tablesize = exec_sql_insert_tablesize % ( db_host_ip.......
####則提示報(bào)錯(cuò):報(bào)錯(cuò)信息是 TypeError: not all arguments converted during string formatting
exec_sql_insert_table_com = exec_sql_insert_tablesize % ( db_host_ip , db_port_s, rw_db_name, rw_table_name , rw_table_rows , rw_data_length , rw_index_length , rw_data_free , rw_auto_increment)
print(exec_sql_insert_table_com)
sql_insert_rst_1 = mysql_exec_sql.mysql_exec_dml_sql(monitor_db_host, monitor_db_port, exec_sql_insert_table_com)
#print(sql_insert_rst_1)
except:
####print('TypeError的錯(cuò)誤信息如下:' + str(TypeError))
print(db_host_ip +' '+str(db_port) + '登入異常無(wú)法獲取table信息,請(qǐng)檢查實(shí)例和訪問(wèn)賬號(hào)!')
exec_sql_error_sql = exec_sql_error % ( 'collect_tables_info',db_host_ip , str(db_port),'登入異常，獲取table信息失敗,請(qǐng)檢查實(shí)例和訪問(wèn)的賬號(hào)!!!' )
sql_insert_err_rst_1 = mysql_exec_sql.mysql_exec_dml_sql(monitor_db_host, monitor_db_port, exec_sql_error_sql)
##print(sql_rst_1)
else:
print('查詢(xún)無(wú)結(jié)果集')
collect_tables_info()
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