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Configuring a LXD Server for Production Use

When using LXD for production, there are often too many file reads happening for the default Ubuntu 18.04 configuration to handle. To solve this, we can make some configuration adjustments to the server itself. In this lab, we do just that.

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Path Info

Level

Beginner

Duration

15m

Last updated

Jul 10, 2025

Challenge

Update /etc/security/limits.conf

Open the /etc/security/limits.conf file and update it with the recommended values:

vim /etc/security/limits.conf

*               soft    nofile          1048576
*               hard    nofile          1048576
root            hard    nofile          1048576
root            soft    nofile          1048576
*               soft    memlock         unlimited
*               hard    memlock         unlimited

Challenge

Update /etc/sysctl.conf

vim /etc/sysctl.conf

fs.inotify.max_queued_events=1048576
fs.inotify.max_user_instances=1048576
fs.inotify.max_user_watches=1048576
vm.max_map_count=262144
kernel.dmesg_restrict=1
net.ipv4.neigh.default.gc_thresh3=8192
net.ipv6.neigh.default.gc_thresh3=8192
kernel.keys.maxkeys=2000

Challenge

Reboot the Server
For changes to take effect, we need to reboot the server itself. We can do this with:
```
sudo reboot
```
Wait for a few minutes, then log back in, if desired.

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