[ClusterLabs] Antw: Re: 答复: the PAF switchover does not happen if the VIP resource is stopped

Thu Apr 26 08:30:18 EDT 2018

On Thu, 26 Apr 2018 10:38:16 +0200
"Ulrich Windl" <Ulrich.Windl at rz.uni-regensburg.de> wrote:

> >>> emmanuel segura <emi2fast at gmail.com> schrieb am 26.04.2018 um 10:00 in  
> Nachricht
> <CAE7pJ3AgTLyoV7-bS=vxshEtrKPvP8o7VKo=vfxEJv4unMW6ZA at mail.gmail.com>:
> > But I think using ifdown isn't the correct way to test the cluster, this
> > topic was discussed many times  
> 
> I agree: But if you cannot pull the plug (like for a VM), what do you
> suggest?: A blockhole route?

You can play with netem: https://wiki.linuxfoundation.org/networking/netem

> 
> > 
> > 2018-04-26 9:53 GMT+02:00 范国腾 <fanguoteng at highgo.com>:
> >   
> >> 1. There is no failure in initial status. sds1 is master
> >>
> >>
> >>
> >> 2. ifdown the sds1 VIP network card.
> >>
> >> 3. ifup the sds1 VIP network card and then ifdown sds2 VIP network card
> >>
> >>
> >>
> >>
> >>
> >> -----邮件原件-----
> >> 发件人: Jehan-Guillaume de Rorthais [mailto:jgdr at dalibo.com]
> >> 发送时间: 2018年4月26日 15:07
> >> 收件人: 范国腾 <fanguoteng at highgo.com>
> >> 抄送: Cluster Labs - All topics related to open-source clustering welcomed
> >> < users at clusterlabs.org>; 李梦怡 <limengyi at highgo.com>  
> >> 主题: Re: [ClusterLabs] the PAF switchover does not happen if the VIP
> >> resource is stopped
> >>
> >>
> >>
> >> On Thu, 26 Apr 2018 02:53:33 +0000
> >>
> >> 范国腾 <fanguoteng at highgo.com> wrote:
> >>
> >>
> >>  
> >> > Hi Rorthais，  
> >>  
> >> >  
> >>  
> >> > Thank you for your help.  
> >>  
> >> >  
> >>  
> >> > The replication works at that time.  
> >>  
> >> >  
> >>  
> >> > I try again today.  
> >>  
> >> > (1) If I run "ifup enp0s3" in node2, then run "ifdown enp0s3" in  
> >>  
> >> > node1, the switchover issue could be reproduced. (2) But if I run  
> >>  
> >> > "ifup enp0s3" in node2, run "pcs resource cleanup mastergroup" to  
> >>  
> >> > clean the VIP resource, and there is no Failed Actions in "pcs  
> >>  
> >> > status", then run "ifdown enp0s3" in node1, it works. The switchover  
> >> could happened again.
> >>  
> >> >  
> >>  
> >> >  
> >>  
> >> > Is there any parameter to control this behaviors so that I don't need  
> >>  
> >> > to execute the "pcs cleanup" command every time?  
> >>
> >>
> >>
> >> Check the failcounts for each resource on each nodes (pcs resource
> >> failcount [...]).
> >>
> >> Check the scores as well (crm_simulate -sL).
> >>
> >>
> >>  
> >> >  
> >>  
> >> > -----邮件原件-----  
> >>  
> >> > 发件人: Jehan-Guillaume de Rorthais [mailto:jgdr at dalibo.com   
> >> <jgdr at dalibo.com>]
> >>  
> >> > 发送时间: 2018年4月25日 18:39  
> >>  
> >> > 收件人: 范国腾 <fanguoteng at highgo.com>  
> >>  
> >> > 抄送: Cluster Labs - All topics related to open-source clustering  
> >>  
> >> > welcomed <users at clusterlabs.org>; 李梦怡 <limengyi at highgo.com> 主题:
> >> > Re:  
> >>  
> >> > [ClusterLabs] the PAF switchover does not happen if the VIP resource  
> >>  
> >> > is stopped  
> >>  
> >> >  
> >>  
> >> >  
> >>  
> >> > On Wed, 25 Apr 2018 08:58:34 +0000  
> >>  
> >> > 范国腾 <fanguoteng at highgo.com> wrote:  
> >>  
> >> >  
> >>  
> >> > >  
> >>  
> >> > > Our lab has two resource: (1) PAF (master/slave)    (2) VIP (bind to  
> >> the
> >>  
> >> > > master PAF node). The configuration is in the attachment.  
> >>  
> >> > >  
> >>  
> >> > > Each node has two network card: One(enp0s8) is for the pacemaker  
> >>  
> >> > > heartbeat in internal network, the other(enp0s3) is for the master  
> >>  
> >> > > VIP in the external network.  
> >>  
> >> > >  
> >>  
> >> > >  
> >>  
> >> > >  
> >>  
> >> > > We are testing the following case: if the master VIP network card is  
> >>  
> >> > > down, the master postgres and VIP could switch to another node.  
> >>  
> >> > >  
> >>  
> >> > >  
> >>  
> >> > >  
> >>  
> >> > > 1. At first, node2 is master, I run "ifdown enp0s3" in node2, then  
> >>  
> >> > > node1 become the master, that is ok.  
> >>  
> >> > >  
> >>  
> >> > > 2. Then I run "ifup enp0s3" in node2, wait for 60 seconds,  
> >>  
> >> >  
> >>  
> >> > Did you check PostgreSQL instances were replicating again?  
> >>  
> >> >  
> >>  
> >> > > then run "ifdown enp0s3" in node1, but the node1 still be master.  
> >>  
> >> > > Why does switchover doesn't happened? How to recover to make system  
> >> work?
> >>
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> >>
> >>  
> > 
> > 
> > -- 
> >   .~.
> >   /V\
> >  //  \\
> > /(   )\
> > ^`~'^  
> 
> 
> 
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-- 
Jehan-Guillaume de Rorthais
Dalibo