Kenno’s Open Note 👋
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How to enable and check linger for a systemd user
“The systemd login manager will terminate any user services when their login session ends unless you enable user lingering with the enable-linger option. Use loginctl with the enable-linger option to configure a user to start during the boot process and prevent the systemd service from terminating when the user session ends.” [1] To enable linger for a user, e.g. kenno, we can run the following command: # loginctl enable-linger kenno I usually ran the above command, and that was it....
Accessing host from inside Podman 5.0 container
Sometimes you need to connect to the host from a Podman container running on it. How would you do that? In the past I was able to get this working by connecting to the gateway IP of the container. For example, I have a web server running on the host listening on port 8080. ➜ nc -vz localhost 8080 Ncat: Version 7.92 ( https://nmap.org/ncat ) Ncat: Connected to 127.0.0.1:8080. Ncat: 0 bytes sent, 0 bytes received in 0....
Expand ZFS partition to use entire disk
This is just a quick note to jot down what I did to resize and expand a ZFS partition to entire disk. I never had to do this before; it tured out it was quite easy. First ensure that the autoexpand option is set on the zpool. Then, stop the VM in order to resize the disk volume. [root@phnomaural ~]# zpool set autoexpand=on immich [root@phnomaural ~]# poweroff [root@phnomaural ~]# Connection to phnomaural closed by remote host....
Fix container to container DNS lookup failed in Podman OpenSUSE Leap 15.16
I’ve started to running more containers in my homelab with Podman, running inside AlamaLinux. Most of the times, things just worked. However today, I tried to setup similar containers on OpenSUSE Leap 15.16 host, and I came across an issue getting containers to communicate with one another. Well, spoiler alert, I found a solution, hence this blog post. TL;DR - install cni-plugin-dnsname package from cni-plugin-dnsname build service. (No package from the official OpenSUSE repo)....
NGINX 413 Request Entity Too Large
While trying to upload a file to a web app using NGINX as a reverse proxy, I encountered the following error: ... Save(<data/c5ceb2d914>) returned error, retrying after 19.847451977s: client.PutObject: <html>Documents/Fonts/FiraCode.zip <head><title>413 Request Entity Too Large</title></head> <body> <center><h1>413 Request Entity Too Large</h1></center> <hr><center>nginx/1.20.1</center> </body> </html> Save(<data/d194099394>) returned error, retrying after 36.899440019s: client.PutObject: <html>Documents/Fonts/FiraCode.zip <head><title>413 Request Entity Too Large</title></head> <body> <center><h1>413 Request Entity Too Large</h1></center> <hr><center>nginx/1.20.1</center> </body> </html> ... It turned out that NGINX has default value for file upload limit to 1 MB set in client_max_body_size variable....
Look up one own's public IP easily
Occasionally, I need to look up my own public IP for various reasons. To do this, I would google “what is my ip”, and got a result on the browser. Recently, I found a way to easily do this using curl command to an easy to remember URL ifconfig.io. Here is an example, of course with the fake IPs as the results: ➜ curl ifconfig.io 2444:3444:20a:5310:d6c9:ffff:fef1:7777 To get the IPv4, we can supply the -4 option to curl command:...
Installing Nerd Font on Fedora
I want to install ‘Hack Nerd Font’ on my laptop running Fedora 40. As of today, there is no RPM package that I am aware of that provides this font. Therefore, I would need to download and install the font manually. Visit the Nerd font website, to choose a preferred font. I like Hack Nerd Font. It can be downloaded from the Download link. Unzip the downloaded (e.g. Hack.zip) and move or copy the directory to ~/....
Resizing a root partition on Linux VM
Well, I recently learned that one of my VMs had its root partition full. The following document on the root partition was resized on that VM. It’s not gonna be something exciting or anything special. However, I feel like I should document anyway, in case I forget on how to do that in the future, and partly due to I no longer work with these type of work as my daily job anymore....
Replacing cron with systemd timer
Well, I don’t currently really have a good reason to replace a working cron job with systemd-timer beside practicing it. The following is the existing cron task for www-data user. I want to convert this cron to a systemd-timer: $ sudo crontab -l -u www-data # m h dom mon dow command */5 * * * * php -f /var/www/nextcloud/cron.php The above output indicates that the command php -f /var/www/nextcloud/cron.php is run at every 5th minute, of course by www-data user....
Upgrading Longhorn with Helm
For my test Kubernetes cluster, Longhorn is used as the persistent block storage. The installed version is 1.6.2, and the version 1.7.0 is available now. So today, I’m going to share how to perform the Longhorn upgrade using Helm. I’m going to try to do this live as usual. Of course, I already created snapshots for all my K8s nodes in case thing goes south. First, let’s verify the current installed version of Longhorn [1]....