1 . \ub9ac\ub205\uc2a4 \ubc84\uc804 \ud655\uc778.<\/P>
\n
<\/P>
\n
– #more \/etc\/issue ( cat \/etc\/issue)<\/P>
\n
– #more \/proc\/version (cat \/proc\/version)<\/P>
\n
<\/P>
\n
<\/P>
\n
2. \uc2dc\uc2a4\ud15c \ud558\ub4dc\uc6e8\uc5b4 \uc815\ubcf4 \ud655\uc778. ( \/proc)<\/P>
\n
<\/P>
\n
<\/P>
\n
– #more \/proc\/cpuinfo ( cpu \uc815\ubcf4 \ud655\uc778 )<\/P>
\n
– #more \/proc\/meminfo (memory \uc815\ubcf4 \ud655\uc778)<\/P>
\n
– #more \/proc\/pci (\ud558\ub4dc\uc6e8\uc5b4 \uc815\ubcf4 \ud655\uc778)<\/P>
\n
<\/P>
\n
<\/P>
\n
3. \uc2dc\uc2a4\ud15c \ub85c\uadf8 \ud655\uc778.<\/P>
\n
<\/P>
\n
<\/P>
\n
– #more \/var\/log\/messages (#tail -f \/var\/log\/messages)<\/P>
\n
\uc2dc\uc2a4\ud15c \ub85c\uadf8 \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
– #more \/var\/log\/secure (#tail -f \/var\/log\/secure)<\/P>
\n
Console \uc811\uc18d \ub85c\uadf8 ( \uc811\uc18d \uc2e4\ud328 \ubc0f \uc811\uc18d \uc131\uacf5 IP \ud655\uc778 )<\/P>
\n
\uc608) \uc811\uc18d \uc131\uacf5 \ub85c\uadf8<\/P>
\n
Sep 5 15:27:24 test sshd[24780]: Could not reverse map address 211.187.90.4.<\/P>
\n
Sep 5 15:27:24 test sshd[24780]: Accepted password for root from 211.187.90.4 port 1457 ssh2<\/P>
\n
<\/P>
\n
<\/P>
\n
– #more \/var\/log\/boot.log <\/P>
\n
\ub9ac\ub205\uc2a4 \uc2dc\uc2a4\ud15c \uc124\uc815 \uc14b\ud305 \uac12 \ud65c\uc131\ud654 \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
– #more dmesg<\/P>
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\ub9ac\ub205\uc2a4 \ubd80\ud305 \uba54\uc2dc\uc9c0 \ubc0f \ub514\ubc14\uc774\uc2a4 \ud655\uc778.<\/P>
\n
<\/P>
\n
<\/P>
\n
– #lastlog<\/P>
\n
\/etc\/passwd \uc5d0 \ub4f1\ub85d\ub41c \uc720\uc800 \uc911 \ucd5c\uadfc \uc811\uc18d\ud55c \uc544\uc774\ub514 \ud655\uc778<\/P>
\n
– #last | more<\/P>
\n
\ub9c8\uc9c0\ub9c9 \uc811\uc18d\ud55c \uc720\uc800 \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
<\/P>
\n
<\/P>
\n
4.\ub124\ud2b8\uc6cc\ud06c \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
– #ifconfig (\ud604\uc7ac \uc124\uc815\ub41c \ub79c\uce74\ub4dc \ud655\uc778)<\/P>
\n
<\/P>
\n
<\/P>
\n
– #netstat -an | more ( #netstat ?an | more LISTEN )<\/P>
\n
\ub9ac\ub205\uc2a4 \uc2dc\uc2a4\ud15c\uc5d0 \uc0ac\uc6a9 \uac00\ub2a5\ud55c \ud3ec\ud2b8 \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
– #netstat -an | grep SYN_RECV<\/P>
\n
SYN Flooding \uacf5\uaca9\uc5ec\ubd80 \uac00\ub2a5\uc131 \uc810\uac80<\/P>
\n
<\/P>
\n
<\/P>
\n
– #mii-tool -v<\/P>
\n
\ub124\ud2b8\uc6cd\ud06c \uc0c1\ud0dc \ud655\uc778<\/P>
\n
[root@mapo log]# mii-tool -v<\/P>
\n
eth0: negotiated 100baseTx-FD, link ok (\uc18d\ub3c4)<\/P>
\n
product info: vendor 00:08:18, model 22 rev 2<\/P>
\n
basic mode: autonegotiation enabled <\/P>
\n
basic status: autonegotiation complete, link ok (\ub124\ud2b8\uc6cc\ud06c \ub9c1\ud06c \uc0c1\ud0dc)<\/P>
\n
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD<\/P>
\n
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control<\/P>
\n
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD<\/P>
\n
eth1: no link<\/P>
\n
product info: vendor 00:08:18, model 22 rev 2<\/P>
\n
basic mode: autonegotiation enabled<\/P>
\n
basic status: no link<\/P>
\n
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD<\/P>
\n
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control<\/P>
\n
[root@mapo log]#<\/P>
\n
<\/P>
\n
<\/P>
\n
– #tcpdump -i eth0 (eth1)<\/P>
\n
Eth0 \uac70\ucc98 \uac00\ub294 \ud328\ud0b7 \ud5e4\ub4dc \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
– #tcpdump -i eth0 -c 22<\/P>
\n
Eth0 \uc5d0 \uac70\ucc98 \uac00\ub294 \ud2b9\uc815 \ud3ec\ud2b8 (22) \ub300\ud55c \ud328\ud0b7 \ud5e4\ub4dc \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
– # ping \ud574\ub2f9 \uc544\uc774\ud53c (\ud1b5\uc2e0 \ud655\uc778)<\/P>
\n
<\/P>
\n
<\/P>
\n
5. \uc2dc\uc2a4\ud15c \uc6a9\ub7c9 \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
– #df -h <\/P>
\n
\uac01 \ud30c\ud2f0\uc158 \uc6a9\ub7c9 \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
Fdisk -l<\/P>
\n
\ub514\uc2a4\ud06c \ud30c\ud2f0\uc158 \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
6. cpu , memory \uc0ac\uc6a9\ub960 \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
#top<\/P>
\n
3:58pm up 61 days, 19:03, 1 user, load average: 0.00, 0.00, 0.00<\/P>
\n
(uptime) (\uc811\uc18d\uc720\uc800)<\/P>
\n
131 processes: 130 sleeping, 1 running, 0 zombie, 0 stopped<\/P>
\n
<\/P>
\n
<\/P>
\n
CPU0 states: 0.0% user, 0.2% system, 0.0% nice, 99.3% idle<\/P>
\n
(cpu 0 \ud604\uc7ac \uc6b4\uc6a9 \uc0c1\ud0dc)<\/P>
\n
CPU1 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle<\/P>
\n
(cpu 0 \ud604\uc7ac \uc6b4\uc6a9 \uc0c1\ud0dc)<\/P>
\n
Mem: 2064692K av, 2052536K used, 12156K free, 0K shrd, 56816K buff<\/P>
\n
(\uc2e4\uc81c \uba54\ubaa8\ub9ac)<\/P>
\n
Swap: 2097112K av, 5564K used, 2091548K free 1916536K cached<\/P>
\n
(\uac00\uc0c1 swap \uba54\ubaa8\ub9ac) (\uc0ac\uc6a9\ub7c9) (\ub0a8\uc740\ub7c9)<\/P>
\n
<\/P>
\n
<\/P>
\n
7. swap \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
#free<\/P>
\n
total used free shared buffers cached<\/P>
\n
Mem: 2064692 2052368 12324 0 56844 1916536<\/P>
\n
-\/+ buffers\/cache: 78988 1985704<\/P>
\n
Swap: 2097112 5564 2091548<\/P>
\n
<\/P>
\n
<\/P>
\n
8. processes \ud655\uc778<\/P>
\n
<\/P>
\n
<\/P>
\n
#ps -ef | more<\/P>
\n
\uc2dc\uc2a4\ud15c\uc5d0\uc11c \uc6b4\uc601\uc911\uc778 \ud504\ub85c\uc138\uc11c \ud655\uc778.<\/P>
\n
9. hostname \ubcc0\uacbd<\/P>
\n
<\/P>
\n
<\/P>
\n
# vi \/etc\/sysconfig\/network <\/P>
\n
\ud30c\uc77c\ub0b4\uc5d0 hostname \ubcc0\uacbd<\/P>
\n
<\/P>
\n
<\/P>
\n
#\/etc\/rc.d\/init.d\/network restart ( \ubcc0\uacbd\ud6c4 \ub124\ud2b8\uc6cd \uc7ac\ubd80\ud305 )<\/P>
\n
<\/P>
\n
<\/P>
\n
10. network ip \uc14b\ud305<\/P>
\n
<\/P>
\n
<\/P>
\n
#more \/etc\/resolv.conf (\ub124\uc784 \uc11c\ubc84\uc815\ubcf4) , \ud3b8\uc9d1 : vi \/etc\/resolv.conf<\/P>
\n
#more \/etc\/hosts (\ud638\uc2a4\ud2b8 \uc815\ubcf4 \ud30c\uc77c) , \ud3b8\uc9d1 : vi \/etc\/hosts<\/P>
\n
<\/P>
\n
<\/P>
\n
#more \/etc\/sysconfig\/network<\/P>
\n
#vi \/etc\/sysconfig\/network-scripts\/ifcfg-eth0 (eth0 \ud574\ub2f9 \uc815\ubcf4 \ubcc0\uacbd)<\/P>
\n
<\/P>
\n
<\/P>
\n
DEVICE=eth0 (\ub79c\uce74\ub4dc \uba85)<\/P>
\n
BOOTPROTO=static (\uc0ac\uc6a9\uc790 \uc124\uc815 \ubc0f \uc790\ub3d9 \ud560\ub2f9)<\/P>
\n
BROADCAST=172.30.0.255 <\/P>
\n
IPADDR=172.30.0.1 (\ub79c\uce74\ub4dc IP)<\/P>
\n
NETMASK=255.255.255.0<\/P>
\n
NETWORK=172.30.0.0<\/P>
\n
GATEWAY=172.30.0.1 (\uac8c\uc774\ud2b8 \uc6e8\uc774)<\/P>
\n
GATEWAYDEV=eth0 (default \uac8c\uc774\ud2b8\uc6e8\uc774)<\/P>
\n
ONBOOT=yes (\ubd80\ud305\uc2dc \uc790\ub3d9 \ud65c\uc131\ud654)<\/P>
\n
<\/P>
\n
<\/P>
\n
\uc124\uc815\uc644\ub8cc\ud6c4 : \/etc\/rc.d\/init.d\/network restart<\/P>
\n
<\/P>
\n
<\/P>
\n
– shell \ud658\uacbd\uc5d0\uc11c \ubcc0\uacbd \uba85\ub839\uc5b4\ub97c\uc774\uc6a9\ud55cIP\uc8fc\uc18c\ud560\ub2f9\ubc0f\ubcc0\uacbd<\/P>
\n
<\/P>
\n
<\/P>
\n
#ifconfig eth0 192.168.0.253 netmask 255.255.255.0 broadcast 192.168.0.255 up <\/P>
\n
#route add default gw 192.168.0.254 dev eth0 (\uac8c\uc774\ud2b8 \uc6e8\uc774 \uc124\uc815)<\/P>
\n
<\/P>
\n
<\/P>
\n
– \uc720\ud2f8\ub9ac\ud2f0\ub97c\uc774\uc6a9\ud55cIP\uc8fc\uc18c\ud560\ub2f9\ubc0f\ubcc0\uacbd<\/P>
\n
#netconfig <\/P>
\n
#system-config-network <\/P>
\n
#redhat-config-network
<\/P><\/p>\n","protected":false},"excerpt":{"rendered":"
1 . \ub9ac\ub205\uc2a4 \ubc84\uc804 \ud655\uc778. – #more \/etc\/issue ( cat \/etc\/issue) – #more \/proc\/version (cat \/proc\/version) 2. \uc2dc\uc2a4\ud15c \ud558\ub4dc\uc6e8\uc5b4 \uc815\ubcf4 \ud655\uc778. ( \/proc) – #more \/proc\/cpuinfo ( cpu \uc815\ubcf4 \ud655\uc778 ) – #more \/proc\/meminfo (memory \uc815\ubcf4 \ud655\uc778) – #more \/proc\/pci (\ud558\ub4dc\uc6e8\uc5b4 \uc815\ubcf4 \ud655\uc778) […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":""},"categories":[405],"tags":[453,545,546,547],"jetpack_featured_media_url":"","amp_enabled":true,"_links":{"self":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1007"}],"collection":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1007"}],"version-history":[{"count":0,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1007\/revisions"}],"wp:attachment":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1007"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1007"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1007"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}