diff --git a/cloud-init/yum.automate-security-updates.yaml b/cloud-init/yum.automate-security-updates.yaml
new file mode 100644
index 0000000..93c49e6
--- /dev/null
+++ b/cloud-init/yum.automate-security-updates.yaml
@@ -0,0 +1,9 @@
+#cloud-config
+
+write_files:
+  - path: /etc/cron.daily/security-updates
+    permissions: '0755'
+    content: |
+      #!/bin/bash
+      dnf -y upgrade --security --nobest
+    defer: true
diff --git a/knowledge base/systemd.md b/knowledge base/systemd.md
index f8e1f9a..abab0a8 100644
--- a/knowledge base/systemd.md	
+++ b/knowledge base/systemd.md	
@@ -86,6 +86,9 @@ journalctl -F '_GID'
 # Filter logs by path.
 journalctl '/usr/bin/bash'
 
+# Filter logs by identifier (like a tag).
+journalctl -t 'CROND'
+
 # Display kernel logs only.
 # Works like `dmesg`.
 journalctl -k