add: implement basic server

README.md

@@ -12,30 +12,8 @@ tier N1 VM. That extra hop doesn't matter.
 ## Config
 
 Configure nginx to do what you want, test it. Use any Node IP for your testing.
-This will become the 'template_dir' in the argument to the LB.
+This tool accepts an argument (rewrite_string) which will be replaced using these rules:
 
-Move that directory to somewhere new, i.e. `/etc/nginx-template/`. Make
+1. For each line that contains rewrite string:
-a symlink from that new directory to the old one (i.e.,
+2. Copy the line once per node IP, replacing the string with host IPs
-`ln -s /etc/nginx-template /etc/nginx/`).
 
-Make a workspace directory for this tool; it will write configs to this folder
-before updating the symlink you created above. It needs to be persistent so on
-server reboot the service starts ok (i.e., `mkdir /var/skubelb/`).
-
-Make sure the user running the tool has read access to the template folder, read-write
-access to the workspace folder and config symlink.
-
-Run the server with a command like:
-
-```sh
-skubelb --needle some_node_ip \
-    --workspace_dir /var/skubelb \
-    --config_symlink /etc/nginx \
-    --template_dir /etc/nginx-template
-    --listen 0.0.0.0:8080
-```
-
-Replacing `some_node_ip` with the node IP you used during the initial setup.
-
-Next, configure the Kubernetes nodes to POST `http://loadbalancer:8080/register` when
-they started, and DELETE `http://loadbalancer:8080/register` when they shutdown.