Re: [lvs-users] FTP persistence template synced between director nodes?

To: Julian Anastasov <ja@xxxxxx>
Subject: Re: [lvs-users] FTP persistence template synced between director nodes?
Cc: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
From: Phillip Moore <pdm@xxxxxxxxx>
Date: Sun, 3 Feb 2019 15:21:29 -0600
On Sun, Feb 3, 2019 at 1:30 PM Julian Anastasov <ja@xxxxxx> wrote:

>         The templates are synced but when it happens depends on the sysctl
> vars. What is your configuration?
> grep . /proc/sys/net/ipv4/vs/sync_*

We are pretty much running defaults with respect to sync I believe.


> /proc/sys/net/ipv4/vs/sync_qlen_max:383646

> /proc/sys/net/ipv4/vs/sync_refresh_period:0

> /proc/sys/net/ipv4/vs/sync_retries:0

> /proc/sys/net/ipv4/vs/sync_sock_size:0

> /proc/sys/net/ipv4/vs/sync_threshold:3 50

We've had some unrelated issues on tcp session setup for non-ftp sessions
if the network is in such flux that the SYN and SYN-ACK land on different
hosts. This is rare and we try to avoid this happening but I think the 3
above means 3rd packet, so it wouldn't have synced with the SYN-ACK comes.

I appreciate your feedback with these settings with respect to the
persistence templates.

Phillip Moore
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