diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 4d55b9a..cccfcc6 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -4,11 +4,11 @@
     "type": "split",
     "children": [
       {
-        "id": "1087b450f262b613",
+        "id": "a501687bc170241a",
         "type": "tabs",
         "children": [
           {
-            "id": "8b827181a4fc3cb5",
+            "id": "55679479f22d17d3",
             "type": "leaf",
             "state": {
               "type": "empty",
@@ -128,17 +128,18 @@
       "templater-obsidian:Templater": false
     }
   },
-  "active": "8b827181a4fc3cb5",
+  "active": "55679479f22d17d3",
   "lastOpenFiles": [
+    "KB/Linux/AMD.md",
+    "KB/Linux/Server/DNS.md",
+    "KB/Linux/Server/Client certificate generation.md",
+    "KB/Linux/Server/ArchLinux Bootstrap.md",
     "KB/Linux/Server/PostgreSQL.md",
     "KB/Linux/Server/Docker Volume Migration.md",
     "KB/Linux/Server/Domains.md",
-    "KB/Linux/Server/DNS.md",
-    "KB/Linux/Server/Bootstrap.md",
     "KB/Linux/Server/Hetzner/Storagebox.md",
     "KB/Linux/DNS.md",
     "KB/Linux/GNOME.md",
-    "KB/Linux/AMD.md",
     "KB/Linux/Wireguard.md",
     "KB/Linux/Pacman.md",
     "KB/Linux/Kernel.md",
@@ -155,7 +156,6 @@
     "KB/Linux/Migrate to rootless docker 1.md",
     "KB/Linux/Migrate to rootless docker.md",
     "KB/Linux/Server/Hetzner/Upgrades.md",
-    "KB/Android/ADB Backup.md",
     "KB/Linux/Desktop/Firewall"
   ]
 }
\ No newline at end of file
diff --git a/KB/Linux/Server/Bootstrap.md b/KB/Linux/Server/ArchLinux Bootstrap.md
similarity index 100%
rename from KB/Linux/Server/Bootstrap.md
rename to KB/Linux/Server/ArchLinux Bootstrap.md
diff --git a/KB/Linux/Server/Client certificate generation.md b/KB/Linux/Server/Client certificate generation.md
new file mode 100644
index 0000000..079e9fb
--- /dev/null
+++ b/KB/Linux/Server/Client certificate generation.md	
@@ -0,0 +1,41 @@
+---
+creation date: 2023-11-23
+tags: [cert,ssl,openssl,server,linux]
+---
+
+```shell
+#!/usr/bin/env bash
+#
+# Based on https://gist.github.com/mtigas/952344
+
+CLIENT_ID="user";
+CLIENT_SERIAL="01";
+
+echo "Create a Certificate Authority root";
+
+openssl genrsa -aes256 -passout pass:xxxx -out ca.pass.key 4096
+openssl rsa -passin pass:xxxx -in ca.pass.key -out ca.key
+rm ca.pass.key
+openssl req -new -x509 -days 3650 -key ca.key -out ca.pem
+
+echo "Create the Client Key and CSR";
+
+openssl genrsa -aes256 -passout pass:xxxx -out ${CLIENT_ID}.pass.key 4096
+openssl rsa -passin pass:xxxx -in ${CLIENT_ID}.pass.key -out ${CLIENT_ID}.key
+rm ${CLIENT_ID}.pass.key
+openssl req -new -key ${CLIENT_ID}.key -out ${CLIENT_ID}.csr
+openssl x509 -req -days 3650 -in ${CLIENT_ID}.csr -CA ca.pem -CAkey ca.key -set_serial ${CLIENT_SERIAL} -out ${CLIENT_ID}.pem
+cat ${CLIENT_ID}.key ${CLIENT_ID}.pem ca.pem > ${CLIENT_ID}.full.pem
+
+
+echo "Bundle client key into a PFX file";
+openssl pkcs12 -export -out ${CLIENT_ID}.full.pfx -inkey ${CLIENT_ID}.key -in ${CLIENT_ID}.pem -certfile ca.pem
+
+
+echo "use ca.pem on nginx, import ${CLIENT_ID}.full.pfx into browser"
+
+```
+
+
+
+