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1500 questions
111
votes
5 answers

an upstream response is buffered to a temporary file

I have a rather large and slow (complex data, complex frontend) web application build in RoR and served by Puma with nginx as reverse proxy. Looking at the nginx error log, I see quite a few entries like: 2014/04/08 09:46:08 [warn] 20058#0: *819237…
ngw
  • 1,321
111
votes
6 answers

Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?

This is a Canonical Question about Fighting Spam. Also related: How to stop people from using my domain to send spam? What are SPF records, and how do I configure them? There are so many techniques and so much to know about fighting SPAM.…
Chris S
  • 78,455
111
votes
9 answers

How to stop people from using my domain to send spam?

I receive Mailer Daemon messages saying certain emails fail. My domain is itaccess.org which is administered by Google apps. Is there any way I can identify who is sending emails from my domain, and how they are doing it without me creating an…
Billy Moon
  • 1,437
111
votes
7 answers

Is there a way to do a remote "ls" much like "scp" does a remote copy?

Is there a way to do a remote "ls" much like "scp" does a remote copy in a standard linux shell?
yazz.com
  • 7,953
111
votes
20 answers

Why should I firewall servers?

PLEASE NOTE: I'm not interested in making this into a flame war! I understand that many people have strongly-held beliefs about this subject, in no small part because they've put a lot of effort into their firewalling solutions, and also because…
Ernie
  • 5,402
111
votes
1 answer

InnoDB: Error: log file ./ib_logfile0 is of different size

I just added the following lines in /etc/mysql/my.cnf after I converted one database to use InnoDB engine. innodb_buffer_pool_size = 2560M innodb_log_file_size = 256M innodb_log_buffer_size = 8M innodb_flush_log_at_trx_commit =…
jack
  • 1,745
110
votes
8 answers

Multiple commands in Docker CMD directive

Not understanding what is happening when I try to execute two commands at runtime via CMD directive in `Dockerfile. I assumed that this should work: CMD ["/etc/init.d/nullmailer", "start", ";", "/usr/sbin/php5-fpm"] But it's not working. Container…
Vladan
  • 1,303
110
votes
15 answers

ssh tunnel refusing connections with "channel 2: open failed"

All of a sudden (read: without changing any parameters) my netbsd virtualmachine started acting oddly. The symptoms concern ssh tunneling. From my laptop I launch: $ ssh -L 7000:localhost:7000 user@host -N -v Then, in another shell: $ irssi -c…
lorenzog
  • 2,979
110
votes
7 answers

How can the little guys effectively learn and use Puppet?

Six months ago, in our not-for-profit project we decided to start migrating our system management to a Puppet-controlled environment because we are expecting our number of servers to grow substantially between now and a year from now. Since the…
drumfire
  • 1,709
110
votes
10 answers

How do I update a CentOS server's time from an authoritative time server?

I have CentOS machine and each time I've noticed that the server loses correct time after a while. It is usually behind by several minutes after time passes from having manually set the correct time. Is there a mechanism whereby I can update the…
user111196
  • 1,257
110
votes
8 answers

How can a single disk in a hardware SATA RAID-10 array bring the entire array to a screeching halt?

Prelude: I'm a code-monkey that's increasingly taken on SysAdmin duties for my small company. My code is our product, and increasingly we provide the same app as SaaS. About 18 months ago I moved our servers from a premium hosting centric vendor to…
Stu Thompson
  • 3,379
110
votes
5 answers

Should a wildcard SSL certificate secure both the root domain as well as the sub-domains?

I ask this question, because Comodo are telling me that a wildcard certificate for *.example.com will also secure the root domain example.com. So with a single certificate, both my.example.com and example.com are secured without warning from a…
josswinn
  • 1,215
110
votes
2 answers

escaping double quotes and percent signs (%) in cron

The following command works from prompt but not from crontab. grep abc /var/log/messages | grep "`date '+%B %d'`" | mail -s"abc log of `hostname`" s.o+`hostname`@gmail.com I need to add it to daily cron.
shantanuo
  • 3,669
110
votes
4 answers

Perform rsync while following sym links

I have a directory that contains symbolic links to other directories located on different media on my system: /opt/lun1/2011 /opt/lun1/2010 /opt/lun2/2009 /opt/lun2/2008 /opt/lun3/2007 But the symbolic links show up…
ensnare
  • 2,332
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  • 42
110
votes
3 answers

Can I create a top level TLD? (.michael for instance)

It appears that ICANN is allowing the creation of top level domains. Instead of 'registering' a domain, you would essentially be signing up to be a registrar (you'd be giving out registrations on your TLD). How do they decide whether to…
Michael Pryor
  • 1,293
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