add faq from hussein

docs/faq.md

@@ -50,7 +50,7 @@ Manta will ask the user to authenticate upon the next operation against `prealps
 
 ---
 
-**Q: My sessions are failing due to an error while running ansible playbook. How can Iinteractively run my ansible outside the management plane?**
+**Q: My sessions are failing due to an error while running ansible playbook. How can I run my ansible outside the management plane?**
 
 **A:** You can start an `ephemeral session`, ephemeral sessions tries to replicate the host targeting the ansible playbook started by the session. To start an ephemeral environment run the following command
 
@@ -206,4 +206,20 @@ $ manta set runtime-configuration -H my_cluster -c my_configuration
 
 **Q: How to set kernel parameters for a cluster?**
 
-**A:** `manta set kernel -H my_cluster `
+**A:** `manta set kernel -H my_cluster -k ip=dhcp quiet ksocklnd.skip_mr_route_setup=1 cxi_core.disable_default_svc=0 cxi_core.enable_fgfc=1 cxi_core.sct_pid_mask=0xf spire_join_token=${SPIRE_JOIN_TOKEN}`
+
+---
+
+**Q: How to update node boot images?**
+
+**A:** To update the boot image based on a configuration name (recomended) for all the nodes in a cluster `manta set boot-image -H my_cluster -c my_configuration_name`
+To update the boot image based on an image id for all the nodes in a cluster `manta set boot-image -H my_cluster -i dbc5300c-3c98-4384-a7a7-28e628cbff43`
+
+---
+
+**Q: How to refresh the user authentication token?**
+
+**A:** 1) Delete the auth token for the intended system/site `manta config unset auth`
+2) Check manta is using the right site `manta config show`. This command should ask user to authenticate again since the auth token was deleted in the previous command
+
+