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Haproxy 1.8 : Drain or Set Weight 0 - Layer 4 & layer 7

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1

We have deployed multiple Haproxys TCP mode haproxy for the DB front and layer 7 haproxy for app front in production. I am looking for which is the best option to take one backend node out of traffic and do update/release/maintenance on applications. either I use Set server state Drain or set weight 0 which one will be effective and useful to slowly redirect all the clients connection to the other backends for app with out breaking and redirect all tcp connections as well ?
also let me know whats meant by persistent connections ?

haproxy

share|improve this question

asked Apr 9 at 4:22

SAGAR NairSAGAR Nair

1084

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1

We have deployed multiple Haproxys TCP mode haproxy for the DB front and layer 7 haproxy for app front in production. I am looking for which is the best option to take one backend node out of traffic and do update/release/maintenance on applications. either I use Set server state Drain or set weight 0 which one will be effective and useful to slowly redirect all the clients connection to the other backends for app with out breaking and redirect all tcp connections as well ?
also let me know whats meant by persistent connections ?

haproxy

share|improve this question

asked Apr 9 at 4:22

SAGAR NairSAGAR Nair

1084

New contributor

SAGAR Nair 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 | 

We have deployed multiple Haproxys TCP mode haproxy for the DB front and layer 7 haproxy for app front in production. I am looking for which is the best option to take one backend node out of traffic and do update/release/maintenance on applications. either I use Set server state Drain or set weight 0 which one will be effective and useful to slowly redirect all the clients connection to the other backends for app with out breaking and redirect all tcp connections as well ?
also let me know whats meant by persistent connections ?

haproxy

share|improve this question

asked Apr 9 at 4:22

SAGAR NairSAGAR Nair

1084

New contributor

SAGAR Nair 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

asked Apr 9 at 4:22

SAGAR NairSAGAR Nair

1084

New contributor

SAGAR Nair 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

asked Apr 9 at 4:22

SAGAR NairSAGAR Nair

1084

New contributor

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

asked Apr 9 at 4:22

SAGAR NairSAGAR Nair

1084

New contributor

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

asked Apr 9 at 4:22

SAGAR NairSAGAR Nair

1084

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Use Drain.

That prevents new sessions being directed to the backend in question, however existing sessions will still be directed to that backend. Hence you should wait a reasonable amount of time for users to end their session (depending on the type of workload this could be a couple of minutes up to a day).

This of course is assuming that you have sticky sessions configured in haproxy, so that a user will always be directed to the same backend. If this is not the case, then it makes no difference if you use weight 0 or drain.

Persistent connections are connections that stay open. If you want to use those, then ensure that haproxy timeouts are long enough to cater to those connections; otherwise haproxy may close a connection that is still in use (but idle).

share|improve this answer

answered Apr 9 at 8:55

wurtelwurtel

2,923512

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks for the excellent answer, btw do u have any links to official documentation to backup your answer so I can make document for my team with that link too. Moreover, I am using the admin page GUI of the haproxy to set drain, and use socket to set weight 0 since its unavailable in GUI. so is there any way we can add our custom commands like "set weight 0" to the haproxy admin GUI page ? please share if u know how to do this.
  
  – SAGAR Nair
  Apr 10 at 4:29
  

  
  
  
  

add a comment | 

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2

Use Drain.

That prevents new sessions being directed to the backend in question, however existing sessions will still be directed to that backend. Hence you should wait a reasonable amount of time for users to end their session (depending on the type of workload this could be a couple of minutes up to a day).

This of course is assuming that you have sticky sessions configured in haproxy, so that a user will always be directed to the same backend. If this is not the case, then it makes no difference if you use weight 0 or drain.

Persistent connections are connections that stay open. If you want to use those, then ensure that haproxy timeouts are long enough to cater to those connections; otherwise haproxy may close a connection that is still in use (but idle).

share|improve this answer

answered Apr 9 at 8:55

wurtelwurtel

2,923512

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks for the excellent answer, btw do u have any links to official documentation to backup your answer so I can make document for my team with that link too. Moreover, I am using the admin page GUI of the haproxy to set drain, and use socket to set weight 0 since its unavailable in GUI. so is there any way we can add our custom commands like "set weight 0" to the haproxy admin GUI page ? please share if u know how to do this.
  
  – SAGAR Nair
  Apr 10 at 4:29
  

  
  
  
  

add a comment | 

2

Use Drain.

That prevents new sessions being directed to the backend in question, however existing sessions will still be directed to that backend. Hence you should wait a reasonable amount of time for users to end their session (depending on the type of workload this could be a couple of minutes up to a day).

This of course is assuming that you have sticky sessions configured in haproxy, so that a user will always be directed to the same backend. If this is not the case, then it makes no difference if you use weight 0 or drain.

Persistent connections are connections that stay open. If you want to use those, then ensure that haproxy timeouts are long enough to cater to those connections; otherwise haproxy may close a connection that is still in use (but idle).

share|improve this answer

answered Apr 9 at 8:55

wurtelwurtel

2,923512

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks for the excellent answer, btw do u have any links to official documentation to backup your answer so I can make document for my team with that link too. Moreover, I am using the admin page GUI of the haproxy to set drain, and use socket to set weight 0 since its unavailable in GUI. so is there any way we can add our custom commands like "set weight 0" to the haproxy admin GUI page ? please share if u know how to do this.
  
  – SAGAR Nair
  Apr 10 at 4:29
  

  
  
  
  

add a comment | 

Use Drain.

That prevents new sessions being directed to the backend in question, however existing sessions will still be directed to that backend. Hence you should wait a reasonable amount of time for users to end their session (depending on the type of workload this could be a couple of minutes up to a day).

This of course is assuming that you have sticky sessions configured in haproxy, so that a user will always be directed to the same backend. If this is not the case, then it makes no difference if you use weight 0 or drain.

Persistent connections are connections that stay open. If you want to use those, then ensure that haproxy timeouts are long enough to cater to those connections; otherwise haproxy may close a connection that is still in use (but idle).

share|improve this answer

answered Apr 9 at 8:55

wurtelwurtel

2,923512

share|improve this answer

answered Apr 9 at 8:55

wurtelwurtel

2,923512

answered Apr 9 at 8:55

wurtelwurtel

2,923512

answered Apr 9 at 8:55

wurtelwurtel

2,923512