lxd: Fix version in snap
snap refresh lxd --channel=3.18
Check and modify mtu of a connection
To check:
[root@lxd-node3 ~]# netstat -i
Kernel Interface table
Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
ens10 1450 455 0 0 0 671 0 0 0 BMRU
eth0 1500 28 0 0 0 32 0 0 0 BMRU
lo 65536 0 0 0 0 0 0 0 0 LRU
Modify temporarily:
ifconfig eth0 mtu 1450
Permanently: edit /etc/sysconfig/network-scripts/ifcfg-eth0 file and add:
MTU=1450
Might be the reason why the system can establish HTTP connection but HTTPS
Useful wifi commands
List used wifi frequencies
sudo iwlist wlp1s0 scan | grep Frequency | sort | uniq -c | sort -n
List available channels
iwlist channel
List wifi networks
nmcli d wifi
Lxd on Fedora 31
Fedora 31 has started to use cgroups v2 by default. According to Common F31 bugs it doesn’t play nice with Docker, lxd and others. To make fedora switch back to the old cgroups:
sudo grubby --update-kernel=ALL --args="systemd.unified_cgroup_hierarchy=0"
How to check what hides behind an alias
To check what command is assigned to the alias use type command:
$ type gl
gl is aliased to `git log --oneline`
Monitor process with top
One liner to monitor a process with the name /wshub:
top -p "$(pgrep -f /wshub)"
Monitor cpu and memory usage of the process
Print every second cpu and memory usage of the process:
watch -n 1 "ps -eo pid,pcpu,pmem,args | kazy -i xnotitle -e kazy"
Prettify json output in curl
Install jq package:
sudo dnf install jq
Usage example:
curl -u key:x "https://api.com/users.json" | jq
How to regenerate grub configuration
sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
Log quires in dnsmasq
Add the following line to dnsmasq configuration file:
log-queries