komanda, matyti iš kurių IP buvo prisijungta prie ssh

 grep "sshd.*Accepted" /var/log/auth.log | awk '{print $11}' | sort | uniq

 grep "sshd.*Accepted" /var/log/secure | awk '{print $11}' | sort | uniq

inode usage paieskos

 greitas top direktoriju radikjlis, randantis net giliai esancias direkmtorijas

{ find / -xdev -printf '%h\n' | sort | uniq -c | sort -k 1 -n; } 2>/dev/null

vienos direktorijos inode counteris:

find . -printf "%h\n" | cut -d/ -f-2 | sort | uniq -c | sort -rn

greitas trynimas senesniu nei 20d failu

find /opt/remi/php54/root/var/lib/php/session/ -atime +20 | xargs -r rm

shell script as a daemon

 https://unix.stackexchange.com/questions/426862/proper-way-to-run-shell-script-as-a-daemon

template:

https://gist.github.com/shawnrice/11076762

browser imitavimas, automatizavimas

 node + selenium-webdriver + chromdriver.  Galimybe virtualiai uzkrauti psl ir pagal xpath trigetint veiksums ar nuskaityti info,. console, tinkla ir t.t.

komandų paleidimas kitame serveryje per SSH

 https://www.shellhacks.com/ssh-execute-remote-command-script-linux/

git lokalios direktorijos sharinimas tarp linux useriu

https://stackoverflow.com/questions/3242282/how-to-configure-an-existing-git-repo-to-be-shared-by-a-unix-group#

detect spamming sript

Pirmiausia, žiūrėti mail log:
1829AB7A07E3: uid=48 from=<aaa@bbb.lt>
Pirmas stulpelis - mail quue id, antras - proceso id, kuris siunčia.

php.ini turi būti nustatyta:  mail.add_x_header = On

postcat -q <ID>      - pagal mail que id pažiūrėti laišką

postcat -q DA5E8647235C | grep X-PHP-Originating-Script

X-PHP-Originating-Script: 45:badmailer.php

The number 45 is the UID, which is the Linux user ID that ran the script

postcat -q DA5E8647235C | grep sasl_username

Resend messages in the queue:   postqueue -f

Pastaba: susitvarkus, paleisti   postsuper -d ALL  

nes kitaip dar  tukstanciai padetu laisku gali buti.

Papildomai, iš išorės galima blokuoti SMTP (jungiantis iš servo rašyti localhost): 
iptables -A INPUT -p tcp -s localhost --dport 25 -j ACCEPT 

letsencrypt free sll instalation and usage

https://letsencrypt.org/
https://www.hostinger.com/tutorials/vps/how-to-install-lets-encrypt-ssl-on-vps-running-vebmin-virtualmin#gref
https://helpdesk.ssls.com/hc/en-us/articles/115001610352-How-to-install-a-SSL-certificate-in-Webmin
https://blog.flaunt7.com/how-to-use-lets-encrypt-on-vesta-login-panel/

pipe email to script

https://www.virtualmin.com/node/18059
https://www.virtualmin.com/node/13762
https://serverfault.com/questions/258469/how-to-configure-postfix-to-pipe-all-incoming-email-to-a-script
https://stackoverflow.com/questions/4321159/postfix-and-sending-incoming-emails-to-script-instead-of-sending

http://php-mail-client.github.io/Client/
https://code.google.com/archive/p/imapcopy/  bei imapsync

Postfix / sendmail /dovecot paleidimas

Postfix yra naujesnė Sendmail atmaina.
Sendmail konfigūravimas, kad priimtų paštą iš išorės: https://superuser.com/questions/927122/configure-sendmail-server-to-accept-external-incoming-emails   bei https://launchtimevps.com/support/settingupemail.jsp
Dovecot - reikalingas tik tam, jei naudojamas imap.
Be Dovecot laiškus galime skaityti tik iš serveripo vidaus.

Sukonfiginimas:
https://www.rosehosting.com/blog/install-and-configure-a-simple-mail-server-using-sendmail-and-dovecot-on-a-fedora-20-vps/

imapsync: http://nynim.org/blog/2010/08/08/backup-your-google-apps-or-gmail-e-mail-over-imap-using-imapsync/

imapsync sample:
imapsync --host1 108.177.15.108 --ssl1 --port1 993 --user1 ssss@aaaa.eu --password1sdsdsdd --host2 localhost --user2 sadddd --password2 Saffff --useheader "Message-Id" --skipsize --allowsizemismatch --syncinternaldates --split1 100 --split2 100 --include "INBOX"  --maxbytespersecond 10000  --automap

linux run cmd after startup

init.d arba cron variantai:
https://stackoverflow.com/questions/12973777/how-to-run-a-shell-script-at-startup?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa

inode detect directories

du --inodes -S | sort -rh | sed -n \
        '1,50{/^.\{71\}/s/^\(.\{30\}\).*\(.\{37\}\)$/\1...\2/;p}'

arba tiesiog suskaiciuoti failus aplankuose:

du -a | cut -d/ -f2 | sort | uniq -c | sort -nr

rsync backup from remote server using SSL keys

https://www.contentecontent.com/blog/2015/01/automated-rsync-backups-from-a-webserver-to-qnap-nas/

GREP paieska failuose, reikiamoje direktorijoje, su exclude

grep -rnw --exclude={*.gz,*.wav,*.pdf} '/home/website/public_html/' -e 'paieksosfraze'

blokavimas srauto country based

https://www.ip2location.com/blockvisitorsbycountry.aspx
https://www.vultr.com/docs/how-to-block-ips-from-a-country-on-centos-6

https://blog.laimbock.com/2013/09/22/how-to-block-countries-with-ipdeny-ip-country-blocks-ipset-and-iptables-on-el6/

https://superuser.com/questions/996526/ubuntu-iptables-allow-only-allow-1-country

Ps: ipset neveikia ant openVZ

centos 6 php versijos ijungimas

https://doc.owncloud.org/server/8.2/admin_manual/installation/php_55_installation.html

Disable loading the old PHP Apache modules by changing their names:

mv /etc/httpd/conf.d/php.conf /etc/httpd/conf.d/php54.off
mv /etc/httpd/conf.modules.d/10-php.conf /etc/httpd/conf.modules.d/10-php54.off

Copy the PHP 5.5 Apache modules into place:

cp /opt/rh/httpd24/root/etc/httpd/conf.d/php55-php.conf /etc/httpd/conf.d/
cp /opt/rh/httpd24/root/etc/httpd/conf.modules.d/10-php55-php.conf /etc/httpd/conf.modules.d/
cp /opt/rh/httpd24/root/etc/httpd/modules/libphp55-php5.so /etc/httpd/modules/

Then restart Apache:

service httpd restart

load balancing and high availability

tool http://www.linuxvirtualserver.org/

rsync over ssh with public key (no pass)

https://www.digitalocean.com/community/tutorials/how-to-copy-files-with-rsync-over-ssh

linux cmd delete files in subdirectories older than x days

Be careful with special file names (spaces, quotes) when piping to rm.

There is a safe alternative - the -delete option:

find /path/to/directory/ -mindepth 1 -mtime +5 -delete
That's it, no separate rm call and you don't need to worry about file names.

Replace -delete with -depth -print to test this command before you run it (-delete implies -depth).

shareimprove this answer
edited May 25 '15 at 18:10

Stephen Kitt
59k9104140
answered May 25 '15 at 16:44

basic6
1,5951018
6
Also use -type f to delete files only (and keep sub directories) – Oleg Mar 4 '16 at 8:44
1
Alternatively, if you want to do the same for all files NEWER than five days: find /path/to/directory/ -mindepth 1 -mtime -5 -delete – zmonteca Apr 19 '16 at 17:29

PHP kodo cache precompiled - APC

APC caches the complied PHP code so for next time, time for compiling PHP will be reduce and gives faster performance.

https://anandarajpandey.com/2014/07/15/how-to-install-apc-in-centos-for-php-better-performance-opcode/
https://www.mervcodes.com/install-apc-alternative-php-cache-in-centos-567-and-fedora-2021/