a cache stores temporary data nearby so that it can be retrieved much more quickly than fetching it from the real backing store (disk, network), or recalculating some result all over again

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23
votes
3answers
9k views

What is safe to exclude for a full system backup?

I'm looking for a list which paths/files are safe to exclude for a full system/home backup. Considering that I have a list of installed packages. /home/*/.thumbnails /home/*/.cache ...
3
votes
2answers
1k views

Can I use all my RAM for application data?

I have yet another question about "where is my Linux memory" Question goes: can I use cache for application data? On my laptop I have 1GB ram. Situation after some time of work: browser takes 400MB ...
10
votes
5answers
30k views

Best way to set up DNS caching?

In order to speed up DNS lookups, I want to install a DNS cache or proxy. I can see at least three programs I think will do the job: bind9, pdnsd, or dnsmasq. I would like to make sure that if I ...
8
votes
3answers
953 views

Would there be any negative side-effects of sharing /var/cache/apt/ between two systems?

In the interest of conserving bandwidth, I'm considering mounting a VirtualBox host's /var/cache/apt as /var/cache/apt in the guest. Both host and guest are Ubuntu 10.10 32-bit. Would there be any ...
6
votes
3answers
3k views

How can I disable the prefetch cache?

I run a few Ubuntu servers that have a load of django sites running on them. The sites and the httpd start at boot and after that (apart from me SSHing in to update it or using bzr to update websites) ...
2
votes
2answers
573 views

How to recreate cache for “APTonCD” after cleaning cache through apt-get clean?

I recently had to opt for cleaning my cache through apt-get clean after getting lots of GPG errors during update. But it's created another problem for me since I want to create an "APTonCD" for ...
3
votes
1answer
564 views

What do these apt commands do?

What do these commands do? Acquire::http::No-Cache=True -o Acquire::BrokenProxy=true update Acquire::http::Max-Age "0"
8
votes
3answers
6k views

How to clean caches in my homedir

My home directory is getting huge (100GB plus). When backupping it I notices that there are quite some caches there. Which important caches are there in my homedir and how should I clean them? One ...