failed to accept an incoming connection: connection from “192.168.1.100” rejected, allowed hosts: “127.0.0.1”
vim /etc/zabbix/zabbix_agentd.conf
Server=127.0.0.1,192.168.1.100
dovecot enable plaintext auth
disable_plaintext_auth = no
service dovecot restart
* OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ AUTH=PLAIN AUTH=CRAM-MD5] Dovecot (Ubuntu) ready
cPanel whitelist sender
WHM >> Service Configuration >> Exim Configuration Manager
Sender verification bypass IP addresses
Trusted SMTP IP addresses
ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 192.168.1.100
apt install apt-transport-https ca-certificates gnupg -y
echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key --keyring /usr/share/keyrings/cloud.google.gpg add -
apt update
apt install google-cloud-sdk
gcloud init
Welcome! This command will take you through the configuration of gcloud.
Your current configuration has been set to: [default]
You can skip diagnostics next time by using the following flag:
gcloud init --skip-diagnostics
Network diagnostic detects and fixes local network connection issues.
Checking network connection...done.
Reachability Check passed.
Network diagnostic passed (1/1 checks passed).
You must log in to continue. Would you like to log in (Y/n)?
sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main" >> /etc/apt/sources.list.d/pgdg.list'
wget -q https://www.postgresql.org/media/keys/ACCC4CF8.asc -O - | apt-key add -
apt update
apt install postgresql-9.4
script /dev/null
screen
postgresql check databases for errors
pg_dumpall -f /dev/null 2> /tmp/pg.err
mysqldump --single-transaction sourcedb | ssh remote_server_ip 'mysql destinationdb'
apt install hping3
hping3 -c 15000 -d 120 -S -w 64 -p 80 –flood –rand-source 192.168.1.100
systemctl stop mongod.service
apt update
apt install mongodb-org=3.6.8 mongodb-org-mongos=3.6.8 mongodb-org-server=3.6.8 mongodb-org-shell=3.6.8 mongodb-org-tools=3.6.8
systemctl start mongod.service
mongo
db.adminCommand( { setFeatureCompatibilityVersion: "3.6" } )
db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } )
vi /etc/apt/sources.list.d/mongodb-org-4.0.list
deb [arch=amd64] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 multiverse
apt update mongodb*
apt upgrade
#include
#include
struct utmp foo;
main()
{
printf("%lu\n", sizeof foo);
return 0;
}
Perl:
$utmp_size = utmp_record_size_goes_here;
$wtmp_file = "wtmp filename goes here";
open WTMP, "+<", $wtmp_file or die "$wtmp_file: ", $!;
seek WTMP, -10 * $utmp_size, 2;
truncate WTMP, tell(WTMP);
close WTMP;
* * * * * /usr/bin/flock -w 0 /tmp/cron.lock /usr/bin/php7.4 /path/to/cron.php
vim /etc/php/7.4/cli/php.ini;
short_open_tag=On;
pt-online-schema-change alters a table’s structure without blocking reads or writes. Specify the database and table in the DSN. Do not use this tool before reading its documentation and checking your backups carefully.