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Jun
24
accepted How can you test a backup / secondary MX server?
Jun
23
asked How can you test a backup / secondary MX server?
Jun
21
comment Recommended DNS SOA record TTL default?
All those intodns / dnscog / dnsstuff etc type sites just copy the same misinformation from each other. You can tell because a lot of their text is copy-pasted. I've found MXToolbox (mxtoolbox.com/DNSCheck.aspx) to be a more reliable resource. For example, their explanation of the SOA MINTTL value here is accurate - a rare quality.
Jun
21
comment Recommended DNS SOA record TTL default?
Really, there is so much misinformation about what these records mean online that it's hard to find anything that's actually true. In summary, most of the values in the SOA record are meaningless for actual DNS queries, and are intended instead for you to use for your own internal zone transfer mechanism from your primary to secondary nameservers. The exception is the MinTTL but that isn't, as the standards suggest, minimum TTL nor is it a "default" TTL, but instead a suggested TTL for caching negative results. What matters much more are the individual TTLs for records like A and NS.
Jun
7
comment Recommended DNS TTL
Both those standards you quote are referring to the "Minimum" field of the SOA record only, which is no longer used for determining the default or minimum TTL anyway, as was intended back when those standards were written. DNS best practices written 27 and 18 years ago were written when DNS - indeed the internet - was a different beast. Nowadays, 300 seconds (5 minutes) is a fairly common TTL for main A/AAAA records, although only useful when needing fast failover otherwise 6 hours+ would be more appropriate. NS records, and the A/AAAA records for the NS addresses, are usually 1 day or more.
May
31
answered Force dig to resolve without using cache
May
31
comment How to get Ubuntu back into pristine conditions?
Presumably it is always logged in dpkg.log whether you use aptitude, apt-get or anything else is that right?
May
1
comment How can I make an internet facing TFTP server secure?
From wikipedia: "Due to the lack of security, it is dangerous to use it over the Internet. Thus, TFTP is generally only used on private, local networks."
Apr
28
comment How to investigate the cause of a 100% CPU event that lasted for hours?
It's unlikely to happen again, at least in a reasonable time frame that would allow some closure. It didn't happen for about a year of that server running that configuration, and so far hasn't happened since. I was hoping to get some advice on to what extent it's possible to investigate something that happened in the past. Have I done all that's possible?
Apr
28
comment How to investigate the cause of a 100% CPU event that lasted for hours?
I've added some more info to the question.
Apr
28
revised How to investigate the cause of a 100% CPU event that lasted for hours?
added 74 characters in body
Apr
28
comment How to investigate the cause of a 100% CPU event that lasted for hours?
Disk and memory usage were normal/unaffected during that time as shown in other charts (not pictured). The charts are compiled by a script that runs every 5 minutes installed on the VPS by default by the VPS provider. They report CPU, memory, disk and network usage every 5 minutes. The CPU is the only one that shows an anomaly. I have a daily backup that runs a couple of hours prior to the start of this "event". It seemed to run normally although it did cause a higher server load (but not CPU utilisation) than normal, pointing to a possible I/O congestion issue.
Apr
28
asked How to investigate the cause of a 100% CPU event that lasted for hours?
Feb
26
revised How to understand /etc/mtab?
added 182 characters in body
Jan
24
comment Why nginx gzip_http_version defaults to HTTP 1.1
The first sentence has been removed from newer versions of the documentation, so presumably it does now still send the Vary header. But the impossibility of using keep-alive when gzipping on HTTP 1.0 (because the content-length cannot be known prior to output) still exists and there's no way around that. So decide which is worse: HTTP 1.0 clients missing out on gzip, or HTTP 1.0 clients missing out on keep-alive (which often isn't possible for dynamic scripts on HTTP 1.0 anyway).
Jan
24
comment Why nginx gzip_http_version defaults to HTTP 1.1
This setting does not control what HTTP version is used, it controls whether gzip should be disabled for HTTP 1.0 requests.
Nov
8
revised What is the worst distro on Linode?
added 177 characters in body
Jul
17
revised Reverse DNS the reason my Mails are rejected?
added 34 characters in body
Jul
17
answered Reverse DNS the reason my Mails are rejected?
Jul
14
awarded  Notable Question