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bio website BlackMesh.com
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visits member for 4 years, 7 months
seen Jan 19 at 17:24

Director of Emerging Technology at BlackMesh Managed Hosting, longtime Linux aficionado, sometime Drupal developer (and d.o sysadmin), and occasional filesystem tinkerer.


Jun
20
comment varnish error 503 service unavailable guru meditation
Correct. To put it another way: either drop the ^ and $, or swap == for ~, in the line where you test for whether to set req.backend to app02.
Jun
20
comment How to do a file/dir exists conditional in Puppet?
You are absolutely correct. Thank you for the taking the time to find that link. I have deleted my comment so as not to confuse the issue. I would like to propose an update your answer, however. Manifests are compiled on the master, but are evaluated on the client. In particular, without this clarification, the mechanism of function of "onlyif" and similar directives becomes unclear.
Jun
10
comment extract file on remote server without SSH access
@MIfe Good point! Big enough for a 10+ MB database, given that we're compressing. But yes, for bigger sizes, simply throw the base64 data into a file on the destination side. To re-emphasize: not always the most elegant solution, but occasionally the most practical. Use other solutions if you can.
May
31
comment How do I improve the performance of my Drupal site with a lot of concurrent users?
Excellent! To this I'd add a few notes: 1) Be sure to enable and configure APC. In particular, ensure your apc.shm_size is sufficient to avoid filling the cache. 2) The importance of a tool like Varnish cannot be overstated. Even if 100% of your pages are dynamic and uncacheable, a good VCL will enable you to remove all load related to static content like images, meaning you'll still see a benefit. 3) memory_limit=6000M is not just absurd, it's actually bad. If you have an out-of-control child, you want it to die much sooner than after it malloc(6g)s (and probably OOMs the box).
May
7
comment FTP ip reached by using SFTP command but not FTP
For the sake of extra confusion, I'll also mention FTPS: FTP over SSL. It's the bastard stepchild of HTTPS and FTP, and it's horrid, but you do occasionally find it in use. There's also TFTP, which is a whole 'nother thing yet. So in total, when someone says FTP, if they're not being precise, they could mean any of four different protocols—(plain ol') FTP, SFTP, FTPS, or TFTP. At press time, a new version of the FTP discussion protocol, tentatively named dFTP, is being worked on to facilitate accurate interhuman conversations regarding the FTP protocol flavor in use.
May
7
comment apc “open() /www/cache/xxx failed. no such file or directory” error
I hate to say it, but at this point, you're probably looking at greping across the PHP files, and dump of any relevant database(s), looking for e4ce8db565491cdcf27ab61a441xxxx, or failing that, for "cache". This will be ugly, but if you can't reliably reproduce the issue, you have little other choice. Are you sure there's nothing in common amongst the clients hitting this issue (e.g. same User-Agent)?
May
3
comment apc “open() /www/cache/xxx failed. no such file or directory” error
Sergey is absolutely correct. Try going to the referer page with a browser that supports request tracing (e.g. using a "developer console", Firebug, etc.). With that, look for a request to this "cache" directory. It's coming from somewhere. Failing that, it might be someone trying to hack the site and simply spoofing the Referer header in the course of looking for a specially-named file. You didn't mention if this message appears often and from diverse clients; if not, that might lead you to such a conclusion.
May
3
comment Nginx reverse proxying Drupal content served with Apache
What's in your Apache's error log for the 500? You call the 500 "standard", but is that an nginx 500 or an Apache 500?
Apr
23
comment The Apache mod rewrite module doesn't work when using the IP
@KristvanBesien: A <VirtualHost> need not contain a ServerName directive. In the absence of one, it will use the top-level ServerName (typically dynamically determined). Additionally, any configured and applicable (based on its IP/port tuple(s)) VHost will always "win" versus the main context.
Mar
18
comment How to monitor glusterfs volumes
@ArieSkliarouk: Updated to cover both cases, but be forewarned that the relevant message was removed in November 2011; see git.gluster.org/… . Thus, this is likely not going to work on newer Glusters. If you find the shorter code harder to understand, that's fine, but it is significantly more robust than using a temporary file, so consider refactoring it for readability instead of dismissing it for perceived lack of that attribute.
Feb
16
comment CentOS lost Root Access
Speaking as someone who works for a hosting company: if you ask Support to give you a hand with this, I 100% guarantee they have a process in place for adding these sorts of parameters to the boot process. And if you ask very nicely and describe what you did very well, they'll likely be able to very quickly solve your limit issue. There's even a small chance they can do it without rebooting the machine.
Feb
14
comment Varnish not showing custom headers
@Kenny: Great! Please update your question and close it.
Feb
12
comment Varnish not showing custom headers
Also, while we're on documentation: please include a complete request/response pair (not just the response as you have above), and the output of "varnishlog" (you can sanitize IP addresses if you'd like, but leave the rest alone, please) during that test.
Feb
12
comment Varnish not showing custom headers
@Kenny so I take it that your X-Wut header isn't showing up? It might be worthwhile to simply dump your entire VCL in here. In this case, we're looking for mistakes, and requiring you to know where those mistakes are only works if you already know what mistakes you made. For example, you're modifying the req in your vcl_fetch, which isn't going to accomplish very much in almost all cases. This tells me that you probably are building a VCL largely from snippets, which means we need to see the whole kit 'n' caboodle in order to diagnose the cause of the symptoms you're seeing.
Feb
4
comment Mysql very slow, out-of-the-box configuration
@Netismine: You want to attach it to the "mysqld" process. Can you post your my.cnf in the question section as an edit, so it's easier to read?
Jan
3
comment Running drupal as root in order for it to run bash scripts
If running on RHEL (or similar), you'll also need to add: Defaults:www-data !requiretty
Aug
14
comment One ip on port 80 with mutiable vhost different names and ports
Why are the VHosts on port 8080 and 8081, respectively? What is port 80 doing, then? Is there a proxy in here somewhere, or is Apache acting as one?
Jul
31
comment large number of InnoDB tables plus SHOW TABLE STATUS
You didn't mention whether you were using 5.5, 5.1 with InnoDB plugin, or something older/nastier. If using something older, you may need to adjust the innodb_additional_mem_pool_size. Related question: Do you see anything in the mysql error log during SHOW TABLE STATUS runs?
Jul
31
comment large number of InnoDB tables plus SHOW TABLE STATUS
Your table_open_cache appears to be too small, but otherwise your settings seem reasonable, if a bit arbitrary (5400 MB buffer pool, rather than 5 GB even?). Try bumping table_open_cache to 1536 and see what happens.
Jul
25
comment large number of InnoDB tables plus SHOW TABLE STATUS
Are these databases actually in their own .ibds? What's the size of your innodb_buffer_pool? How are table_open_cache, open_files_limit, and the sysctl fs.file-max set? How much memory do you have under Cached in free -m? What's your vm.vfs_cache_pressure set to? Is your disk subsystem performant? I'm beating so hard on this because generating table statistics should be very, very fast in the vast majority of cases; if it's not, that's at best a misconfiguration, because otherwise it's a bug.