551 reputation
1622
bio website
location Yokosuka, Japan
age 47
visits member for 5 years, 8 months
seen Jan 16 at 7:40

Englishman from Royal Leamington Spa who has lived continuously in Japan since 1988.


Jan
9
answered How can I tell a script is running under cron?
Jan
9
comment How can I tell a script is running under cron?
I added that there are other features that I want to run only when under cron. For implementation, it might be better to explicit enable these features via the command line but my question is whether you can tell if you are under cron.
Jan
9
revised How can I tell a script is running under cron?
added 57 characters in body
Jan
8
comment How can I tell a script is running under cron?
Verbosity was just one of the uses I was thinking of...
Jan
8
asked How can I tell a script is running under cron?
Sep
24
awarded  Autobiographer
Jul
21
awarded  Popular Question
Jul
2
awarded  Curious
Jun
30
accepted Debugging fstab problems on reboot
Jun
3
awarded  Popular Question
Apr
9
awarded  Popular Question
Jan
12
awarded  Nice Question
Dec
10
awarded  Notable Question
Oct
30
comment What determines the time to first ping response in an OS?
@joeqwerty in some managed services, the failure to respond to ping is escalated to the owner of the server. When a new VM is started up there will be a certain delay until Ping replies starts and these are logged as failures. Picky customers have asked "Why are we getting alerts?". I want to know exactly what services have to be up for Ping to be returned. e.g. Naïve administrators may assume erroneously that the network card will return pings as soon as it gets power, but that is obviously incorrect.
Oct
30
accepted What determines the time to first ping response in an OS?
Oct
30
comment What determines the time to first ping response in an OS?
Obviously it is not the firewall that responds to ping nor is it the network card. If I am not mistaken, the card just places the Ethernet frames in a buffer for the operating system's TCP Stack/Driver to inspect and respond to. The firewall hooks into the TPC Stack to modify it's behaviour. i.e. to filter certain packets and/or to allow the TPC Stack to return or not return ICMP ECHO requests. I think you will find that the network card doesn't come into this discussion at all..
Oct
25
asked What determines the time to first ping response in an OS?
Sep
29
awarded  Notable Question
Sep
9
revised What is the strategy for detecting time drift in a linux based data centre?
added 3 characters in body
Sep
2
asked What is the strategy for detecting time drift in a linux based data centre?