zzorica - soultrace

Terraform-AWS random instance names in Auto Scaling groups and tag propagation to volumes

When you use Auto Scaling groups to deploy instances, every instance is named the same if you setup the Name tag inside aws_autoscaling_group to be propagated at launch. Last few days I've been looking how to make instance names, that is their Name tag, get random values. There

lvm

LVM automatic snapshots on boot

If you are using LVM on your system (be it server or personal desktop) it is good to have snapshot ready in case something goes wrong during daily operations. Prerequisite is that you have enough space on your volume group to create required logical volume snapshots and for this guide

kubernetes

Create context for remote cluster administration

This is a short guide on how to create context on your local machine so you could administer remote kubernetes cluster with kubectl. First we need to create our certificate request. We can do this on our local machine. Important part is to set CN to username we will use

kubernetes

Join node as master to existing cluster

Recently I got CKA certification and one thing I was constantly shuffling around and trying to achieve is simply join another node as master to already existing cluster. Join as worker is pretty simple but as master things aren't going so well... Anyway I managed to do it just a

linux-administration

Open ssh URLs in chrome and firefox

If you are using some simple web applications that provides list of devices that you can connect using ssh it is useful to auto launch terminal with ssh connection started. I am doing this on debian 9.5, chromium 69.0 and firefox 60.3. First we need to setup

networking

MikroTik backup script

How to write simple script for automatic backup of MikroTik configuration and upload to FTP server. Similar as I wrote about Cisco configuration backup in post CISCO automatic configuration backup here I will show you how am I doing backups of MikroTik network devices. There are 2 types of MikroTik

xenserver

XenServer - join host with different number of interfaces to existing pool

If your host has different number of interfaces then hosts in existing pool you need to make sure the names of interfaces are in order with those in pool. It means that if you use 8 NICs in pool and new host has 10 NICs you need to user first

linux-administration

Nextcloud client on debian stretch (9.5)

There is only ppa archive for nextcloud client installation so in this guide we will add it to debian repo list and install it. We will use "add-apt-repository" command. To be able to use the command in Debian, you need to install the"software-properties-common" and after add ppa repo in

dell

Dell Storage Manager Client on debian 9.5

DellSMC comes in windows and linux version. Linux is .rpm version. To install it on debian system you need to convert it to .deb package. Download DellSMC and extract it: wget https://downloads.dell.com/FOLDER04688892M/1/DellEMCStorageClientLinux-16.3.20.31.zip unzip DellEMCStorageClientLinux-16.3.20.31.zip Archive: DellEMCStorageClientLinux-16.

linux-administration

Digital Ocean 'Spaces' mounting and scripts

If you are using DO (Digital Ocean) Spaces feature then you are probably thinking of scripting or even mounting this "share" on your pc or even on Droplet itself. First, I would like to mention that I recently switch this blog to Digital Ocean and pointed my domain registrar to

dd

DD getting progress status

There are a few ways you can get progress/status of your dd command. Here are 3 examples I know: Using pv Install pv (pv - monitor the progress of data through a pipe): sudo apt install pv Now you can pipe your dd command to see progress: dd bs=

linux-administration Featured

Sys admin tips

Too small to be put in separate post I will use this one "feature" post for putting all the little tricks I am using in my daily work. So when I remember something usefull or stumble on something new I't will go here... 1. find your public IP from CLI

mysql

MySQL (MariaDB) database backup script

If you need to make regular backups of your mysql databases and store them on the remote site here is one way you could do it. Recently I build up 2 MariaDB servers, one master and the other slave. Alongside this replication I wanted to have daily backups of all

xenserver

Xen Orchestra installation from source

16/07/2020 - latest xoa version needs nodejs v10 so it is corrected below 20/06/2019 - reflected changes in config file .xo-server.yaml to .xo-server.toml I had an error in path where .xo-server.yaml file should be placed. It is corrected now. Main problem today when

node_exporter

Prometheus node_exporter with perccli textfile collector on xenserver

If using prometheus/grafana setup for monitoring you probably used node_exporter for exporting machine metrics. I will show you how to install node_exporter together with perccli utility on xenserver host. Prior to node_exporter 0.15.0 megacli was integrated as collector (only disabled by default) and used

linux-administration

Mount network share after boot and/or depending on network location

To address the problem of auto-mounting your shares depending on your location in terms of networks, SSID or vpn connected. I used to solve this with scripts be it with systemd services, cron, fstab in some way (_netdev) etc. But presently I use NetworkManager[1] and it's dispatcher service. If

linux-administration

Disable ipv6 on Debian/Ubuntu

If you don't need ipv6 and wanna keep network "clean" especially for local servers/services you can easily disable ipv6. 1. check to see ipv6 under interfaces configuration (you can see ipv6 info for every interface) ip a sh 1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default link/

networking

CISCO automatic configuration backup

This is one of few ways you can get configuration backups from CISCO devices in a scheduled way. At least I know 2 ways using archive[1] or kron[2] feature. I will explain both ways, though personally I use kron. Of course both ways doesn't apply to ASA devices

linux-administration

NTP time sync with systemd-timesyncd

With systems that are using systemd[1] as init system there is no need to install ntpd daemon anymore if you only need to sync local time with your NTP server. On Debian distro systemd-timesyncd service can be found by default from Stretch (9.0) version. So in order to