Lab
A Cloud Guru

Manage kernel modules and their parameters

In this exercise, you need to modify a kernel module to provide more information. *This course is not approved or sponsored by Red Hat.*

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Path Info

Level

Advanced

Duration

1h 0m

Published

Apr 04, 2019

Challenge

Enable nf_conntrack time stamping in the running kernel.
Check to see if the module is loaded:
```
lsmod | grep nf_conntrack
```
View the parameters available for the nf_conntrack module:
```
modinfo nf_conntrack
```
Verify the current setting of the timestamp parameter:
```
cat /sys/module/nf_conntrack/parameters/tstamp
```
Stop the firewall and unload the module:
```
systemctl stop firewalld
```
```
modprobe -r nf_conntrack
```
Load the module with timestamping enabled:
```
modprobe nf_conntrack tstamp=1
```
Verify the current setting of the timestamp parameter:
```
cat /sys/module/nf_conntrack/parameters/tstamp
```
Challenge

Make the change persist through a restart.
Make the change persist through a reboot:
```
echo "options nf_conntrack tstamp=1" > /etc/modprobe.d/nf_conntrack.conf
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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