Python 獲取CentOS7的內存使用率並寫入mysql
阿新 • • 發佈：2017-12-22
linux mysql 由於Centos7和6的系統變化挻大的，所以先看看Centos7的內存信息是怎麽樣的。
系統版本：
[root@docker ~]# cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) [root@docker ~]#
查看內存信息：其實只需要關註前5行即可；
[root@docker ~]# cat /proc/meminfo
MemTotal: 2049248 kB
MemFree: 85408 kB
MemAvailable: 1061812 kB
Buffers: 138044 kB
Cached: 885028 kB
SwapCached: 33308 kB
Active: 881088 kB
Inactive: 832516 kB
Active(anon): 315948 kB
Inactive(anon): 375464 kB
Active(file): 565140 kB
Inactive(file): 457052 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 524284 kB
SwapFree: 377836 kB
Dirty: 24 kB
Writeback: 0 kB
AnonPages: 659500 kB
Mapped: 71544 kB
Shmem: 876 kB
Slab: 160772 kB
SReclaimable: 123148 kB
SUnreclaim: 37624 kB
KernelStack: 7408 kB
PageTables: 20580 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 1548908 kB
Committed_AS: 2998548 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 156648 kB
VmallocChunk: 34359541760 kB
HardwareCorrupted: 0 kB
AnonHugePages: 434176 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 73664 kB
DirectMap2M: 2023424 kB
DirectMap1G: 0 kB
[root@docker ~]#
[root@docker ~]# free -m
total used free shared buff/cache available
Mem: 2001 762 81 0 1156 1035
Swap: 511 142 369
[root@docker ~]#內存使用率的計算：mem_used=MemTotal-MemFree-Buffers
python 代碼：
#/usr/bin/env python
import time
import pymysql as mysql
db = mysql.connect(user='dba',passwd='123456',db='memory',host='localhost')
db.autocommit(True)
cur = db.cursor()
def getMem():
f = open('/proc/meminfo')
total = int(f.readline().split()[1])
free = int(f.readline().split()[1])
MemAvailable = f.readline().split()
cache = int(f.readline().split()[1])
mem_use = total-free-cache
t = time.time()
sql = 'insert into memory(memory,time) values(%s,%s)' %(mem_use/1024,t)
cur.execute(sql)
#print mem_use
print ('ok')
while True:
time.sleep(1)
getMem()安裝pymysql模塊
pip install pymysql
創建數據庫以及表：
MariaDB [(none)]> create database memory charset=utf8; MariaDB [(none)]> use memory; MariaDB [(none)]> CREATE TABLE `memory` ( `memory` int(11) DEFAULT NULL, `time` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; 授權用戶 MariaDB [(none)]> grant all on *.* to dba@'localhost' identified by '123456'; MariaDB [(none)]> flush privileges;
執行python代碼，每隔一秒就會打印一個ok到終端，然後在Mysql裏查詢一下；
MariaDB [memory]> select * from memory limit 5; +--------+------------+ | memory | time | +--------+------------+ | 1775 | 1513906229 | | 1775 | 1513906230 | | 1775 | 1513906231 | | 1775 | 1513906232 | | 1775 | 1513906233 | +--------+------------+ 5 rows in set (0.00 sec)
註：Mysql的表只用了兩個字段，一個內存使用率，這個值是以兆為單位的，另一個就是時間了。
MariaDB [(none)]> use memory;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [memory]> show create table memory\G
*************************** 1. row ***************************
Table: memory
Create Table: CREATE TABLE `memory` (
`memory` int(11) DEFAULT NULL,
`time` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec)
MariaDB [memory]>Python 獲取CentOS7的內存使用率並寫入mysql