392 reputation
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bio website starshine.org/jimd
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visits member for 5 years, 3 months
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asked How do I set up an ssh -w tunnel VPN between AWS VPC and a Linode?
Sep
2
awarded  Taxonomist
Aug
26
comment How to enable traceroute in linux machine
Actually the old MS Windows TRACERT.EXE does use UDP rather than ICMP and the Linux version offers options to use TCP (-T) or UDP (-U) instead of the default (ICMP). From the traceroute man page on a Debian system: "We don't want the destination host to process the UDP probe packets, so the destination port is set to an unlikely value (you can change it with the -p flag). There is no such a problem for ICMP or TCP tracerouting (for TCP we use half-open technique, which prevents our probes to be seen by applications on the destination host)." MacOS X seems to default to UDP as well.
Aug
26
revised Postfix: SASL authentication failure: cannot connect to saslauthd server: Permission denied
Adding link to more detailed description and solution/workaround.
Aug
26
answered Postfix: SASL authentication failure: cannot connect to saslauthd server: Permission denied
Aug
21
awarded  Notable Question
Jun
16
comment How to sendmail via command line piping
All POSIX compliant forms of UNIX/Linux should provide some executable named "sendmail" and taking a specific set of options which are compatible with a subset of sendmail's functionality (including the -t option, described in timday's answer, below). Exim, Postfix, and qmail all provide these --- sometimes they'll be installed under /usr/libexec/sendmail rather than /usr/bin or /usr/sbin, for example.
Jun
16
comment How to sendmail via command line piping
This is the canonical approach to safe programmatic mail sending under UNIX.
Jun
16
comment How to sendmail via command line piping
sendmail is the better approach (it's a Posix standard) ... but it's better to use sendmail -t (take the headers from the input stream). This avoids many possible shell variable interpolation vulnerabilities by allowing the program sending mail to interact only with the sendmail utility without invoking any shell at all). See "timday's" answer for better details.
Jan
6
asked AWS VPC custom VIP: How to get a IP Address assumption to work across two EC2 VPC instances?
Jan
5
comment Redis: Configuration Options for limiting key/value sizes?
Perhaps we could find a enhanced (PHP) Redis library to enforce the limits?
Jan
5
comment Redis: Configuration Options for limiting key/value sizes?
From some vague hearsay: we've had some very large keys (set by one application component) cause issues (in other components unwittingly receiving the unexpectedly large values) and also when re-syncing the slaves to the masters.
Jan
4
asked Redis: Configuration Options for limiting key/value sizes?
Nov
14
accepted Redis: INFO doesn't report network/bandwidth metrics?
Nov
12
asked Redis: INFO doesn't report network/bandwidth metrics?
Oct
23
accepted AWS Elastic IP vs. VPC Usage Recommendations: Suggestions?
Oct
4
awarded  Popular Question
Sep
26
asked AWS Elastic IP vs. VPC Usage Recommendations: Suggestions?
Jul
5
revised Can't ssh tunnel to access a remote mysql server
Clarifying distinction between UNIX domain sockets and AF_INET. Fixing some typos and cleaning up wording.
Jul
5
suggested suggested edit on Can't ssh tunnel to access a remote mysql server