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Are host configurations in the SSH config merged?

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2

1

I have the following generic host configuration in my .ssh/ssh_config:

Host *

  ConnectTimeout 5

  ServerAliveInterval 5

  ServerAliveCountMax 12

I also have some specific configurations. For example the following alias:

Host work-server-1

  Hostname a.b.c.d



Host work-server-2

  Hostname i.j.k.l

Now, my question: when logging into the host work-server-1, will SSH also use the ConnectTimeout, ServerAliveInterval and ServerAliveCountMax setting as defined in the Host * entry?

linux networking ssh openssh

share|improve this question

edited 7 hours ago

Martin Prikryl

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asked 8 hours ago

PritzlPritzl

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2

1

I have the following generic host configuration in my .ssh/ssh_config:

Host *

  ConnectTimeout 5

  ServerAliveInterval 5

  ServerAliveCountMax 12

I also have some specific configurations. For example the following alias:

Host work-server-1

  Hostname a.b.c.d



Host work-server-2

  Hostname i.j.k.l

Now, my question: when logging into the host work-server-1, will SSH also use the ConnectTimeout, ServerAliveInterval and ServerAliveCountMax setting as defined in the Host * entry?

linux networking ssh openssh

share|improve this question

edited 7 hours ago

Martin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

asked 8 hours ago

PritzlPritzl

1322 bronze badges

New contributor

Pritzl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I have the following generic host configuration in my .ssh/ssh_config:

Host *

  ConnectTimeout 5

  ServerAliveInterval 5

  ServerAliveCountMax 12

I also have some specific configurations. For example the following alias:

Host work-server-1

  Hostname a.b.c.d



Host work-server-2

  Hostname i.j.k.l

Now, my question: when logging into the host work-server-1, will SSH also use the ConnectTimeout, ServerAliveInterval and ServerAliveCountMax setting as defined in the Host * entry?

linux networking ssh openssh

share|improve this question

edited 7 hours ago

Martin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

asked 8 hours ago

PritzlPritzl

1322 bronze badges

New contributor

Pritzl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

Host *

  ConnectTimeout 5

  ServerAliveInterval 5

  ServerAliveCountMax 12

Host work-server-1

  Hostname a.b.c.d



Host work-server-2

  Hostname i.j.k.l

share|improve this question

edited 7 hours ago

Martin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

asked 8 hours ago

PritzlPritzl

1322 bronze badges

New contributor

Pritzl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 7 hours ago

Martin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

asked 8 hours ago

PritzlPritzl

1322 bronze badges

New contributor

Pritzl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 7 hours ago

Martin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

edited 7 hours ago

Martin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

asked 8 hours ago

PritzlPritzl

1322 bronze badges

New contributor

Pritzl is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 8 hours ago

PritzlPritzl

1322 bronze badges

1 Answer
1

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4

For each directive, the first relevant occurrence in the ssh_config is used.

Quoting man page for ssh_config:

For each parameter, the first obtained value will be used. The configuration files contain sections separated by Host specifications, and that section is only applied for hosts that match one of the patterns given in the specification. ...

Since the first obtained value for each parameter is used, more host-specific declarations should be given near the beginning of the file, and general defaults at the end.

---

So with the configuration file below:

• For all hosts, ServerAliveInterval 1 is always used, 4 and 7 are never used, not even for work.


• 
  ConnectTimeout is 2 for work, for other hosts it's 3.


• For all hosts, the ServerAliveCountMax is 5, the work-specific value 6 is never used, not even for work.

ServerAliveInterval 1



Host work

  ConnectTimeout 2



Host *

  ConnectTimeout 3

  ServerAliveInterval 4

  ServerAliveCountMax 5



Host work

  ServerAliveCountMax 6

  ServerAliveInterval 7

share|improve this answer

edited 6 hours ago

answered 7 hours ago

Martin PrikrylMartin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Much obliged Martin.
  
  – Pritzl
  7 hours ago
  

  
  
  
  

add a comment | 

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4

For each directive, the first relevant occurrence in the ssh_config is used.

Quoting man page for ssh_config:

For each parameter, the first obtained value will be used. The configuration files contain sections separated by Host specifications, and that section is only applied for hosts that match one of the patterns given in the specification. ...

Since the first obtained value for each parameter is used, more host-specific declarations should be given near the beginning of the file, and general defaults at the end.

---

So with the configuration file below:

• For all hosts, ServerAliveInterval 1 is always used, 4 and 7 are never used, not even for work.


• 
  ConnectTimeout is 2 for work, for other hosts it's 3.


• For all hosts, the ServerAliveCountMax is 5, the work-specific value 6 is never used, not even for work.

ServerAliveInterval 1



Host work

  ConnectTimeout 2



Host *

  ConnectTimeout 3

  ServerAliveInterval 4

  ServerAliveCountMax 5



Host work

  ServerAliveCountMax 6

  ServerAliveInterval 7

share|improve this answer

edited 6 hours ago

answered 7 hours ago

Martin PrikrylMartin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Much obliged Martin.
  
  – Pritzl
  7 hours ago
  

  
  
  
  

add a comment | 

4

For each directive, the first relevant occurrence in the ssh_config is used.

Quoting man page for ssh_config:

For each parameter, the first obtained value will be used. The configuration files contain sections separated by Host specifications, and that section is only applied for hosts that match one of the patterns given in the specification. ...

Since the first obtained value for each parameter is used, more host-specific declarations should be given near the beginning of the file, and general defaults at the end.

---

So with the configuration file below:

• For all hosts, ServerAliveInterval 1 is always used, 4 and 7 are never used, not even for work.


• 
  ConnectTimeout is 2 for work, for other hosts it's 3.


• For all hosts, the ServerAliveCountMax is 5, the work-specific value 6 is never used, not even for work.

ServerAliveInterval 1



Host work

  ConnectTimeout 2



Host *

  ConnectTimeout 3

  ServerAliveInterval 4

  ServerAliveCountMax 5



Host work

  ServerAliveCountMax 6

  ServerAliveInterval 7

share|improve this answer

edited 6 hours ago

answered 7 hours ago

Martin PrikrylMartin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Much obliged Martin.
  
  – Pritzl
  7 hours ago
  

  
  
  
  

add a comment | 

For each directive, the first relevant occurrence in the ssh_config is used.

Quoting man page for ssh_config:

For each parameter, the first obtained value will be used. The configuration files contain sections separated by Host specifications, and that section is only applied for hosts that match one of the patterns given in the specification. ...

Since the first obtained value for each parameter is used, more host-specific declarations should be given near the beginning of the file, and general defaults at the end.

---

So with the configuration file below:

• For all hosts, ServerAliveInterval 1 is always used, 4 and 7 are never used, not even for work.


• 
  ConnectTimeout is 2 for work, for other hosts it's 3.


• For all hosts, the ServerAliveCountMax is 5, the work-specific value 6 is never used, not even for work.

ServerAliveInterval 1



Host work

  ConnectTimeout 2



Host *

  ConnectTimeout 3

  ServerAliveInterval 4

  ServerAliveCountMax 5



Host work

  ServerAliveCountMax 6

  ServerAliveInterval 7

share|improve this answer

edited 6 hours ago

answered 7 hours ago

Martin PrikrylMartin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

ServerAliveInterval 1



Host work

  ConnectTimeout 2



Host *

  ConnectTimeout 3

  ServerAliveInterval 4

  ServerAliveCountMax 5



Host work

  ServerAliveCountMax 6

  ServerAliveInterval 7

share|improve this answer

edited 6 hours ago

answered 7 hours ago

Martin PrikrylMartin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

answered 7 hours ago

Martin PrikrylMartin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges

answered 7 hours ago

Martin PrikrylMartin Prikryl

12.2k44 gold badges3737 silver badges8585 bronze badges