Red Hat LinuxÍü¼ÇrootÃÜÂëµÄ½â¾ö°ì·¨
ǰ¼¸Ìì°ÑϵͳµÄrootÃÜÂë¸øÍüÁË£¬²»ÖªµÀÔõô½â¾ö£¬µ½ÍøÉÏËÑÁ˸ö½â¾ö°ì·¨£¬Óë´ó¼Ò¹²Ïí¡£
ÔÚ³öÏÖϵͳѡÔñ½çÃæÊ±£¬ÔÚRed Hat LinuxµÄÑ¡ÏîÉϰ´“e”¼ü£¬È»ºó»á³öÏÖÈý¸öÑ¡ÏÔÚµÚ¶þÏîÀàËÆ“ kernel /vmlinuz-2.4.20-8 ro root=LABEL=/”Éϰ´“e”¼ü½øÐб༣¬ÔÚ“ro”»òÕß“root”ǰ¼ÓÉÏ“single”£¬È»ºó»Ø³µ·µ»Ø¡£°´“b”¼üÆô¶¯£¬½øÈë×Ö·û½çÃæ£¬µ±³öÏÖ“sh-2.05b#”ʱ£¬¾ÍÒâζ×ÅÒѾ½øÈëµ¥Óû§Ä£Ê½¡£ÏÖÔÚ£¬ÊäÈë“passwd root”£¬¾Í¿ÉÒÔÖØÐÂÉèÖÃrootÃÜÂëÁË¡£ÉèÖÃÍê³Éºó£¬rebootÖØÆô£¬ÓøղÅÉèÖõÄÃÜÂë¾Í¿ÉÒÔ½øÈëlinuxϵͳÁË¡£
Ïà¹ØÎĵµ£º
ʹÓÃselectº¯Êý¿ÉÒÔÒÔ·Ç×èÈûµÄ·½Ê½ºÍ¶à¸ösocketͨÐÅ¡£³ÌÐòÖ»ÊÇÑÝʾselectº¯ÊýµÄʹÓ㬹¦Äܷdz£¼òµ¥£¬¼´Ê¹Ä³¸öÁ¬½Ó¹Ø±ÕÒÔºóÒ²²»»áÐ޸ĵ±Ç°Á¬½ÓÊý£¬Á¬½ÓÊý´ïµ½×î´óÖµºó»áÖÕÖ¹³ÌÐò¡£
1. ³ÌÐòʹÓÃÁËÒ»¸öÊý×éfd_A£¬Í¨ÐÅ¿ªÊ¼ºó°ÑÐèҪͨÐŵĶà¸ösocketÃèÊö·û¶¼·ÅÈë´ËÊý×é¡£
2. Ê×ÏÈÉú³ÉÒ»¸ö½Ðsock_fdµÄsocketÃèÊö·û£¬ÓÃÓÚ¼àÌý¶Ë¿ ......
nmÃüÁî
[
ÔÚGNU CÓïÑÔ¿âÌṩµÄÄÚÈÝÖУ¬ÓнӿڿÉÒÔÓÃÀ´×öÕâ¼þÊ¡£ÓÃÏÂÃæµÄÃüÁî²é¿´£º
nm -D /lib/libc.so.6 | grep log
]
nmÃüÁÊDZȽϼòµ¥¶øÇÒÇ¿´óµÄ¡£ËüÓÃÀ´ÁгöÒ»¸öÄ¿±êÎļþÖеĸ÷ÖÖ·ûºÅ¡£·ûºÅµÄÖÖÀàºÜ¶à£¬ÒÔÏÂÊÇһЩ³£¼ûµÄ·ûºÅÀàÐÍ
nmÊä³ö×Ö·û
º¬Òå
R
Read only symbol. ±ÈÈçÔÚ´úÂëÖÐÓÐÒ»¸öconst MAXDATA ......
slab·ÖÅäÆ÷ÐÎÏóµØËµ¾ÍÊÇÏÈÓÉ»ï°é»úÖÆÉêÇë¿ÕÏÐÄÚ´æ¿Õ¼ä£¬È»ºóslab·ÖÅäÆ÷ÔÙ°ÑÕâ¸öÄÚ´æ¿Õ¼ä½øÐзָ°´Í¬Ñù´óСÀ´½øÐзָ×îºóÔÙÓÃһЩÊý¾Ý½á¹¹À´½øÐйÜÀí¡£ÉÏÃæÖ»ÊÇÐÎÏóµØËµ·¨¡£ÎÒÃÇÆ½Ê±°ÑÓÉslab½øÐзָîºóµÄÄÚ´æÎÒÃdzÆÖ®Îª¸ßËÙ»º´æÄÚ´æ¡£ÕâÑù¿´À´¾ÍÖªµÀËùνµÄ¸ßËÙ¾ÍÊÇ˵²»ÊÇÿ´Î·ÖÅäºÍÊÍ·ÅÄÚ´æ¶¼ÒªÕÒ»ï°é»úÖÆ£¬¿ÉÒ ......
#!/bin/bash
cpu=`top -b -n 1 | grep -w Cpu | awk '{print$5}'| awk -F '%' '{printf"%d",$1}'`
if [ $cpu -le 50 ]
then
echo "cpu: $((100 - cpu))%" > test.txt
mail -s "·þÎñÆ÷½ô¼±, CPUÕ¼ÓÃÂʹý¸ß£¡" yourmail@domail.com < test.txt
fi
mem=`top -b -n 1 | grep -w Me ......
£¨Æß£©DNS·þÎñÆ÷ÅäÖÃʵÀý
¾ÙÀýÒ»£º
ʹÓÃviewÓï¾ä´î½¨¾ßÓÐÄÚÍâÊÓͼ¹¦ÄܵÄDNS·þÎñÆ÷£¬²¢Äܹ»¸ùé§²»Í¬µÄ¿Í»§¶ËµØÖ·ÊµÏÖ²»Í¬µÄ½âÎö½á¹û£¬¼ÙÉè¾ÖÓòÍøµØÖ·Îª192.168.255.0/24£¬¾ÖÓòÍøÄÚ¸÷Ö÷»ú·Ö±ðΪrhel1:192.168.255.128; rhel2:192.168.255.12; rhel3:192.168.255.129; rhel4:192.168.255.120; rhel5:192.168.255.4Ϊ ......