linux

gistfile1.txt

[watch]
watch -n 1 docker ps

[script]
-d 파일이 디렉토리인지 체크 
-e 파일이 존재하는지 체크 
-f 파일이 일반적인 파일인지 체크 
-g 파일이 SGID 퍼미션을 가졌는지 체크 
-r 파일이 읽기 가능인지 체크 
-s 파일의 크기가 0이 아닌지 체크 
-u 파일이 SUID 퍼미션을 가졌는지 체크 
-w 파일이 쓰기 가능인지 체크 
-x 파일이 실행 가능인지 체크

str='h1-eth0'
echo ${str%%-*}
echo ${str##*-}

str2='fopnp/base'
echo ${str2%%/*}
echo ${str2##*/}


[net]
# check tcp & udp
telnet host 24224
nmap -p 24224 -sU host


[upstart]
initctl reload-configuration
tail -200f /var/log/syslog
initctl list | grep myservice
sudo start myservice
 
[grep]
grep 409 text.log | grep -v -E  "(mobilehub|festival|place|play|view)"
grep -A10 -B10 409 test.log 

[sh]
servers=(slave1.example.com slave2.example.com slave3.example.com); for s in "${servers[@]}"; do ssh -l ubuntu $s 'sudo apt-get -y install ruby2.0 && sudo gem install bundler' ; don
 
[linux]
mv access-14102[1-6].log /data1/accesslog2/tzt.app.net/
ln -s /data1/accesslog2/tzt.app.net/* .
find -mtime +6 -type d -exec rmdir {} + # rmdir more older 6 days 
find . -name '*.py' | xargs wc -l
ls -1 . | egrep "*result*" | xargs rm
rsync -avz -e ssh user1@host1:/tmp/dump_copies/platform-pool2/* /tmp/dump_copies/platform-pool2

 
[vi]
echo ":set nocp
:set backspace=indent,eol,start" > ~/.vimrc
 
[curl]
response time
curl -o /dev/null -s -w %{time_total}\\n  http://www.google.com 
 
[awk]
awk '$9 == 500' access.log | awk '{print $19}'
awk '$9 == 500' access.log | awk '{print $20}'
awk '{print $20}' access.log
awk '{print $20}' access.log | sort | uniq -c
ll 141006* | awk '{ print; total += $5 }; END { print "total size: ",total }'
 
# SUM
awk 'FS="," {s+=$2} END {print s}' upload.csv
 
# 따옴표로 자르기
awk 'FS="\"" {print $9}' 59.access.log | awk '{print $1}'
 
[process]
ctrl + Z (suspend)
bg (벡그라운드로 보냄)
jobs
fg (fore그라운드로 보냄)
 
from http://se.uzoogom.com/77
 
[git]
# add branch to remote repo
git push origin oauth2
 
# add tag to remote repo
git push --tags # push tags
 
# migration git repo
git remote add new-origin [email protected]:cloudtech/foobar.git
git push --all new-origin
git push --tags new-origin
 
#get remote branch
git checkout -t origin/nginx
git checkout --track origin/ansible

# old commit을 가지고 새로운 branch를 만든다
git branch flash_back 16d28ad

# 삭제, commit, 아직 push전인데 rollback하기
git checkout HEAD^ script/batch-insert-drive-infos.groovy

# generate a deploy key 
ssh-keygen -t rsa -b 4096


[iptables]
iptables -A INPUT -s 172.16.0.1 -p tcp --dport 80 -j DROP
iptables -D INPUT -s 172.16.0.1 -p tcp --dport 80 -j DROP
iptables -D INPUT 1
iptables -L
 
iptables -L -t nat
iptables -I PREROUTING -t nat -p tcp --dport 80  -j REDIRECT --to-port 1080
while iptables -D PREROUTING -t nat -p tcp --dport 80  -j REDIRECT --to-port 2080; do :; done


iptables -L -n -v -x
  -L lists all the rules.
  -n does not resolve the ip addresses.
  -v lists the packet and byte count.
  -x displays the byte count (otherwise it gets abbreviated to 200K, 3M, etc).
 

[postgres app config]
cd /Users/YOURUSERNAME/Library/Containers/com.heroku.postgres/Data/Library/Application\ Support/Postgres/var
pg_hba.conf
host all all 0.0.0.0/0 trust
postgresql.conf
listen_addresses = *
 
[limit]
ulimit -n 30000
ulimit -Hn
ulimit -Sn
lsof | wc -l # current open file count
 
 
sysctl -w net.netfilter.nf_conntrack_max=262144
sysctl net.netfilter.nf_conntrack_count
 
 
[xargs]
ll -al | grep 14B | awk '{print $9}' | xargs rm
 
 
[nginx deny]
 
    location / {
      #deny 192.168.174.97;
      proxy_pass            http://apihub_upstream;
      #proxy_set_header      X-Daum-IP $remote_addr; #for apihub-dev1 which doesn't have a LB
      proxy_set_header      Host $http_host;
      proxy_hide_header     X-Call-Info;
    }
 
[tcpdump]
tcpdump -s 1514 -X dst api.logentries.com
tcpdump -n not src host 10.0.2.2

HTTP Req/Res
------------
IP 13.34010 > 11.80: Flags [S], seq 558033846, win 29200, length 0
IP 11.80 > 13.34010: Flags [S.], seq 389103889, ack 558033847, win 28960, length 0
IP 13.34010 > 11.80: Flags [.], ack 1, win 229, length 0
IP 13.34010 > 11.80: Flags [P.], seq 1:76, ack 1, win 229, length 75
IP 11.80 > 13.34010: Flags [.], ack 76, win 227, length 0
IP 11.80 > 13.34010: Flags [P.], seq 1:18, ack 76, win 227, length 17
IP 13.34010 > 11.80: Flags [.], ack 18, win 229, length 0
IP 11.80 > 13.34010: Flags [FP.], seq 18:595, ack 76, win 227, length 577
IP 13.34010 > 11.80: Flags [.], ack 596, win 238, length 0
IP 13.34010 > 11.80: Flags [F.], seq 76, ack 596, win 238, length 0
IP 11.80 > 13.34010: Flags [.], ack 77, win 227, length 0
 
 
[mongodb]
mongodump --host 10.16.64.138  --port 27017 --db meerkat --out tmp
mongorestore --host db3.fortress.9rum.cc --port 4447 --username meerkat --password kEM4hIsrPZ2wI9RoMDRIck6K --db meerkat tmp/meerkat/
 
mongoexport --host 10.16.64.138  --port 27017 --db meerkat --collection watch --out watch.json
 
use meerkat
db.dropDatabase();


[mount]
grep vdb /proc/partitions
mkfs -t ext4 -L testvol /dev/vdb
mount -L testvol /mnt
umount /mnt


[openssl]
openssl rsa -in server.key -out server.key # 암호제거
openssl x509 -enddate -noout -in file.pem # 만료날자 확인


Linux Directory
- /bin : mostly serves as a standard location for key programs like /bin/sh
- /usr/bin : is for distribution-managed normal user programs.
- /usr/local/bin : is for normal user programs not managed by the distribution package manager, e.g. locally compiled packages.


[Pipe]
2>&1 : stdout, stderr를 모두 한 파일로


[ansible]
ansible apiserver -i production -m shell -a 'ls /'


[apt-get install & key install]

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
(Alternative) 
cat 10gen-gpg-key.asc | sudo apt-key add -


----------------
postgresql 

dbname=> select pg_size_pretty(pg_relation_size('table_name'));


----------------
#!/bin/bash
#msg=`tail -2 /home/deploy/taxi-tracking/log/error.out`
pid=`cat /home/deploy/taxi-tracking/tmp/vertx.pid`
msg=`top -n 1 -b -p $pid | grep java`
echo $msg
curl -X POST --data "to=curt.kim&msg=$msg" http://api.noti.io/send

----------------
socat TCP-LISTEN:5432,fork TCP:pg-server-ip:5432


----------------
base64 /dev/urandom | head -c 10000000 > file.txt