[squid-users] Backing up squid cache and restoring it

[Alex Rousskov]

On 1/20/19 3:04 PM, Eliezer Croitoru wrote:

> This swap.state behavior is only for UFS/AUFS cache_dir or also to rock?

Rock cache_dirs do not use swap.state.

Alex.


> -----Original Message-----
> From: squid-users [mailto:squid-users-bounces at lists.squid-cache.org] On Behalf Of Alex Rousskov
> Sent: Thursday, January 17, 2019 19:23
> To: squid-users at lists.squid-cache.org
> Subject: Re: [squid-users] Backing up squid cache and restoring it
> 
> On 1/17/19 6:47 AM, Arne-Tobias Rak wrote:
> 
>> my goal is to restore a previous cache state in squid 3.x running on
>> Ubuntu 16.04.
>>
>> So far I have tried to create a copy of the /var/spool/squid and
>> /var/log/squid folders.
>> When restoring the cache, I first shutdown squid using
>> /sudo squid -k shutdown//
>> //sudo service squid stop -k
>> /and then restore the previously copied folder contents. I then start
>> squid again using
>> /sudo service squid start./
> 
>> Unfortunately, this does not restore the previous cache contents, as the
>> spool/squid/swap.state file is modified during squid startup.
> 
> Modification of swap.state upon startup is not incompatible with cache
> contents preservation.
> 
> In a clean shutdown context, the swap.state* files are essentially an
> optimization. You may preserve/restore them if you want to speed up
> building of the restored cache index OR you can delete them (and Squid
> will slowly build a new cache index from scratch). Just do not leave the
> newer swap.state* files when trying to restore the old cache.
> 
> If you preserve/restore the old swap.state* files, you may need to
> preserve their timestamps as well.
> 
> 
> If you need further help, please share cache.log entries related to
> cache_dir loading and indicate why you think the old cache contents is
> not preserved. Sharing your cache_dir configuration may also help.
> 
> 
> Cheers,
> 
> Alex.
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