1,231 reputation
1017
bio website toastedsandwi.ch
location Bristol, United Kingdom
age 37
visits member for 5 years, 8 months
seen Dec 19 at 19:29

Sysadmin, programmer, web developer, compiler developer. Attempted blogger (yet to succeed here).


Nov
18
awarded  Caucus
Oct
14
comment Cent OS: How do I turn off or reduce memory overcommitment, and is it safe to do it?
"overcommit_ratio" has an important effect when using overcommit_memory=2 -- it determines the percentage of the physical RAM which is allowed to be allocated! So if ratio < 100 then you will leave some RAM unallocated, perhaps for disk cache or similar. The default ratio is 50% so you'll only use 50% of the physical RAM if you don't change this!
Jul
28
comment How can I tell which interface my Supemicro IPMI is piggybacking on?
If you can ssh into the host then you can also run ipmitool locally as something like "ipmitool raw ..." (numbers given in Supermicro FAQ entry linked to in the answer)
Jul
2
awarded  Curious
Apr
30
awarded  Yearling
Jan
13
awarded  Notable Question
Oct
25
comment Exim drop vs deny for bad recipients
+1 for tarpit being the way to go. Legitimate occasional typos will still give the same result as normal but more slowly, whilst spammers will get bogged-down as you'd like.
Oct
3
comment Puppet : How to override / redefine outside child class (usecase and example detailled)
Unfortunately this method is now deprecated, as dynamic scope variables are being removed in a future version of Puppet -- see docs.puppetlabs.com/guides/scope_and_puppet.html An alternative method is to use variables defined by hiera on a per-node basis (and with a default set in a common data source). This does this all much more cleanly now :)
Sep
6
comment How to send the output from a cronjob to multiple e-mail addresses?
One thing to note -- use just a comma between addresses. Do not use a space as well, otherwise cron will log the address (probably in /var/log/cron or /var/log/daemon) as "UNSAFE" and will refuse to send to that list of addresses.
Apr
30
awarded  Yearling
Aug
22
comment Linux clients on a Windows domains
If you want to have a Windows network with some Unix hosts it's a pretty good choice, but if you want to have full Unix support then there are other problems such as that the UIDs/GIDs won't match between any Unix users you have (say in LDAP) and the Unix emulation layer which Likewise Open provides on top of AD, unless you explicitly set the UIDs in LDAP to be the same as the numbers Likewise produces for you.
Aug
21
accepted Is it safe/secure to use NIS for user and group info (no password hashes)?
Aug
9
comment Home-brew automatic tiered storage solutions with Linux? (Memory -> SSD -> HDD -> remote storage)
Revitalising old questions is better than having then rotting with old and out-of-date information on them!
Aug
6
comment Is NFS + NIS a modern good practice for Linux networks to achieve common logins and home directories?
@voretaq7 Don't use "soft" mounts if at all possible! From the nfs mount manpage: "NB: A so-called "soft" timeout can cause silent data corruption in certain cases. As such, use the soft option only when client responsiveness is more important than data integrity. Using NFS over TCP or increasing the value of the retrans option may mitigate some of the risks of using the soft option."
Aug
6
comment Home-brew automatic tiered storage solutions with Linux? (Memory -> SSD -> HDD -> remote storage)
+1 This looks very interesting -- I shall be keeping an eye on it!
Aug
6
asked Is it safe/secure to use NIS for user and group info (no password hashes)?
Jul
24
comment Why buy high end hardware firewalls?
I've seen "hardware" firewalls which are just a BSD box with some relatively expensive network cards (fibre interfaces, carefully-picked competent ethernet cards or other uncommon interfaces) and a bill of many thousands of pounds/dollars/euros. Really you're paying for someone else to test and support it, and FOSS solutions can almost always give the same performance and reliability -- it just needs a fair amount of testing work to get there.
Jun
8
awarded  Constituent
Jun
8
awarded  Caucus
May
3
awarded  Popular Question