第十一周作业

1、显示统计占用系统内存最多的进程，并排序。

[12:34:24 root@localhost ~]#ps aux --sort -rss |head -7
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
systemd+    1307  1.6  7.3 1576880 223992 pts/2  Ssl+ 12:33   0:01 mysqld
root        3218 12.1  5.5 759684 168788 ?       Sl   12:33   0:04 /opt/py3/bin/python3.8 /opt/py3/bin/celery worker -P threads -A ops -l INFO -c 10 -Q ansible -n ansible@%h
root        3516  9.2  5.3 972856 160768 ?       Sl   12:33   0:03 /opt/py3/bin/python3.8 /opt/py3/bin/celery worker -P threads -A ops -l INFO -c 10 -Q celery -n celery@%h
root        2766  7.4  5.1 895432 154652 ?       Sl   12:33   0:03 /opt/py3/bin/python3.8 /opt/py3/bin/celery flower -A ops -l INFO --url_prefix=/core/flower --auto_refresh=False --max_tasks=1000 --tasks_columns=uuid,name,args,state,received,started,runtime,worker
root        3720  8.6  5.1 527144 154636 ?       Sl   12:34   0:03 /opt/py3/bin/python3.8 /opt/py3/bin/celery beat -A ops -l INFO --scheduler django_celery_beat.schedulers:DatabaseScheduler --max-interval 60
root        2468  5.5  4.7 592568 144700 ?       Sl   12:33   0:02 /opt/py3/bin/python3.8 /opt/py3/bin/gunicorn jumpserver.wsgi -b 0.0.0.0:8080 -k gthread --threads 10 -w 4 --max-requests 4096 --access-logformat %(h)s %(t)s %(L)ss "%(r)s" %(s)s %(b)s  --access-logfile -

2、编写脚本，使用for和while分别实现192.168.0.0/24网段内，地址是否能够ping通，若ping通则输出"success!"，若ping不通则输出"fail!"

#!/bin/bash
NETID=192.168.0.
for HOSTID in {1..254};do
{
	if /bin/ping -c1 -W1 $NETID$HOSTID >/dev/null ;then
		echo "$NETID$HOSTID is up."
	else
		echo "$NETID$HOSTID is down."
	fi
} &   
done 
wait

[12:36:46 root@localhost ~]#chmod +x ip.sh
[12:36:50 root@localhost ~]#bash ip.sh

3、每周的工作日1:30，将/etc备份至/backup目录中，保存的文件名称格式 为“etcbak-yyyy-mm-dd-HH.tar.xz”，其中日期是前一天的时间

#!/bin/bash
[ -d /backup ] || mkdir /backup
rpm -q xz >/dev/null
[ $? -eq 0 ] || yum -y install xz >/dev/null
DATEFORMAT=`date -d yesterday "+%Y-%m-%d-%H"`
tar -cf /backup/etcbak-$DATEFORMAT.tar /etc > /dev/null && xz -z /backup/etcbak-$DATEFORMAT.tar

[12:39:36 root@localhost ~]#chmod +x backup.sh
[12:40:03 root@localhost ~]#vim /etc/crontab

  1 SHELL=/bin/bash
  2 PATH=/sbin:/bin:/usr/sbin:/usr/bin
  3 MAILTO=root
  4 
  5 # For details see man 4 crontabs
  6 
  7 # Example of job definition:
  8 # .---------------- minute (0 - 59)
  9 # |  .------------- hour (0 - 23)
 10 # |  |  .---------- day of month (1 - 31)
 11 # |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
 12 # |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
 13 # |  |  |  |  |
 14 # *  *  *  *  * user-name  command to be executed
 15   30 1  *  *  0 root bash  /data/backup.sh &>/dev/null