Gstewar1: Created page with "Sometimes it is necessary to SSH through a host in order to access another host. Although this can be done by manually SSH-ing from one host to another repeatedly, the same t..."

2019-12-02T15:29:30Z

Created page with "Sometimes it is necessary to SSH through a host in order to access another host. Although this can be done by manually SSH-ing from one host to another repeatedly, the same t..."

New page

Sometimes it is necessary to SSH through a host in order to access another host. Although this can be done by manually SSH-ing from one host to another repeatedly, the same task can be accomplished in one line by jumphosting.

==Dynamic Jumphosts==
Dynamic jumphosts are most useful for times in which you only need to make this jump once, or rather infrequently.

The basic format for jumphosting is
ssh -J user1@host1:port1 user2@host2:port2
However, if ports are the same for different hosts, you can use the format
ssh -J user1@host1 user2@host2
Also, if you need to jumphost through multiple hosts, the format below is also legal
ssh -J user1@host1:port1,user2@host2:port2 user3@host3

==Static Jumphosts==
Static jumphosts are most useful for times in which you will often need to make this jump, and allows you type a short, simple command instead of the longer line as shown in Dynamic Jumphosts section above. In order to create this shortcut, you must edit your ~/.ssh/config file.

===Setup===
In your ~/.ssh/config file
Host directJump
HostName mydirectjump.example.org

Host secondJump
HostName mysecondjump.example.org
ProxyJump directJump
If another jump is needed, the following format can be added as needed to the same ~/.ssh/config file
Host finalJump
HostName myfinaljump.example.org
ProxyJump secondJump

===Use===
After saving the above changes to your ~/.ssh/config file, if you wish to access that final host
ssh finalJump

SSH Jumphosts - Revision history

Gstewar1: Created page with "Sometimes it is necessary to SSH through a host in order to access another host. Although this can be done by manually SSH-ing from one host to another repeatedly, the same t..."