Notes from sysadmin work. Yet another sysadm blog
Prologue: sda old but works, sdc defective. I will replace sdc.
First of all, mark disk sdc as defective and remove from raid.
mdadm --manage /dev/md0 --fail /dev/sdc2 mdadm --manage /dev/md1 --fail /dev/sdc1 mdadm --manage /dev/md2 --fail /dev/sdc3 mdadm /dev/md0 -r /dev/sdc2 mdadm /dev/md1 -r /dev/sdc1 mdadm /dev/md2 -r /dev/sdc3
Physically replace disk and copy partition table to new one.
Continue reading “Replace defective HDD on CentOS 6 (mbr)”In that quickie article we will setup Postfix as yandex relay that servers only local mail (emails for root) on AlmaLinux 8.
dnf install postfix mailx cyrus-sasl-plain
Continue reading “Postfix as Yandex Relay”Couple UFW rules for antizapret node
ufw default deny incoming ufw default allow outgoing ufw allow ssh / ufw allow from 203.0.113.4 to any port 22 ufw allow 1194 ufw route allow proto tcp from any to any port 1194 ufw route allow proto udp from any to any port 1194 ufw allow in on lxdbr0 ufw route allow in on lxdbr0 ufw enable
This released on ubuntu with packages nginx and nginx-extras (some modules used additionally that not avail on Alma packages, that’s why ubuntu).
We will store cached files in /cdncache and logs in /var/log/nginx/cdnlogs.
Our CDN URL is yourcdn1.domain.name for site1.dev and yourcdn2.domain.name for site2.dev
We will server static files (mp4,jpg,png,gif,jpeg,js,ico,html,htm,webp,css,mp3,wav,swf,mov,doc,pdf,xls,ppt,docx,pptx,xlsx,ttf,woff,woff2), accept only GET queries and disallow listing for /.
Continue reading “Nginx as CDN POP”More difficult than on Centos, yeah? 🙂
opkg list-upgradable | cut -f 1 -d ' ' | xargs opkg upgrade
cat /etc/systemd/system/goip.service
We should start goip service after mysql and we should be sure that it will autorestart on crash.
Continue reading “Goip systemd service”Idea: make a queue of calls in which agents will register themselves. A man came to work, dialed a secret combination, “signed up,” and he is all in line and ready to receive calls. Let’s make it happen.
Continue reading “Asterisk & Self Registration Queue”Hey.
Recently I got a task: SIP/100 should accept two calls at the same time and if first line “busy” caller should hear “Operator busy. Please wait”.
I tried to solve that with queue but queue cant announce “OP busy” because it was not busy (2-nd line call).
So I solved that task in next way:
Continue reading “Asterisk Device state INUSE”Hey, just another config draft from me. In that article we will enable fail2ban jail for asterisk on UDP/5060 via iptables.
In /etc/sysconfig/iptables we should allow UDP/5060 for all (if you want to enable only for your subnet why you need fail2ban? Just allow 192.168.1.0/24 and don’t read that article).
Continue reading “Working fail2ban for Asterisk (security log)”