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doc:howto:autossh [2013/07/08 15:40]
tmomas spelling correction
doc:howto:autossh [2015/12/01 12:55] (current)
tmomas link corrected
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 +====== Autossh ======
 +Autossh monitors a ssh connection and reconnects the ssh-session if the connection fails.
 +
 +To automatically log in you need to use an authentication key.
 +
 +The package, slightly outdated, can be found in the '​oldpackages'​ feed.
 +
 +Alternative packages:
 +
 +https://​github.com/​hewenhao2008/​autossh-openwrt
 +
 +https://​github.com/​aa65535/​openwrt-autossh
 +
 +
 +[[doc:​uci:​sshtunnel|sshtunnel]] is a simpler, functionally-identical package.
 +
 +===== Use Case =====
 +  * You want to forward a local port (e.g. the webserver/​ssh) to a remote server.
 +  * If your client running OpenWrt is behind a NAT, this allows to connect to a server that is not behind a NAT and create a reverse tunnel to the local ssh server.
 +
 +===== Installation =====
 +Install autossh
 +<​code>​
 +opkg install autossh
 +</​code>​
 +
 +Create a key
 +<​code>​
 +dropbearkey -t rsa -f /​etc/​dropbear/​id_rsa
 +</​code>​
 +
 +''​dropbearkey''​ will print the public key, starting with ''​ssh-rsa''​. You can reprint the key using 
 +<​code>​
 +dropbearkey -y -f /​etc/​dropbear/​id_rsa
 +</​code>​
 +or write it to a file (e.g. ''/​tmp/​pubkey''​)
 +<​code>​
 +dropbearkey -y -f /​etc/​dropbear/​id_rsa ​ | grep ssh-rsa > /tmp/pubkey
 +</​code>​
 +
 +Add the key to the ''​authorized_keys''​ file on your server.
 +E.g. Copy pubkey file to the server an do 
 +<​code>​
 +cat pubkey >> ~/​.ssh/​authorized_keys
 +</​code>​
 +
 +===== Configuration =====
 +Autossh is configured using the [[doc/uci | Unified Configuration Interface]] (''/​etc/​config/​autossh''​). ​
 +
 +===== Fixes =====
 +To get ssh working you need to replace ''​localhost''​ in ''​2222:​localhost:​22''​ of the ''​ssh''​ variable to the local ip. 
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