diff --git a/content/notes/linux_utils.md b/content/notes/linux_utils.md
index 63014d4..d83466d 100644
--- a/content/notes/linux_utils.md
+++ b/content/notes/linux_utils.md
@@ -110,4 +110,26 @@ tar -xzf yourfile.tar.gz
 ### sync two dirs
 ```
 unison /path/to/dir/one /path/to/dir/two
-```
\ No newline at end of file
+```
+
+### useradd
+```bash
+useradd -m -s /bin/bash username
+userdel -r username
+```
+
+### ssh disable password
+https://askubuntu.com/questions/1516262/why-is-50-cloud-init-conf-created
+
+```sh
+#/etc/ssh/sshd_config.d/00-only-pubkey-auth.conf
+PasswordAuthentication no
+ChallengeResponseAuthentication no
+UsePam no
+```
+
+### Network speed monitor
+```
+slurm
+```
+
diff --git a/content/notes/server/Containers.md b/content/notes/server/Containers.md
index ddefd62..74f5882 100644
--- a/content/notes/server/Containers.md
+++ b/content/notes/server/Containers.md
@@ -59,5 +59,3 @@ Restart=always
 WantedBy=default.target
 ```
 
-## CALENDAR
-