add sops, add nb-epicenter, add readme

README.md

@@ -0,0 +1,28 @@
+# 1. Installation of new servers
+- install ubuntu 20.04
+- get age key from SSH
+```console
+$ nix-shell -p ssh-to-age --run 'ssh-keyscan example.com | ssh-to-age'
+```
+- fix secrets files
+```console
+$ sops': nix-shell -p sops --run "sops updatekeys -y secrets.yaml"
+```
+- run install command
+```console
+$ ./install.sh example.com
+```
+
+# 2. Web Server specific
+- change the permissions for /var/www
+```console
+$ chown nginx:nginx /var/www
+$ chmod 755 /var/www
+```
+
+# 3. Net data
+- Netdata data page: Add a node
+- Once you got the token, we will claim it to associate it to a node:
+- create /var/lib/netdata/cloud.d/token and write the token in it
+- run nix-shell -p netdata --run "netdata-claim.sh -id=$(uuidgen)" as root
+- your node should be registered in Netdata cloud