…one does not simply run both PHP and Rails applications (and MySQL) in single 128 MB box.
This is what happens if you try doing it. Swapping all the time. Hopefully Debian will fare better but it means I’ll need to reinstall the box again. I’ll do a test run in my local machine first though as not to waste my time doing backup/restore again like today.
(Yeah, Zeropaste is up at p.myconan.net)
Tonight, when trying to compile Rubinius with Rubinius, I got some errors and wanted to report to relevant party. As usual, the log of what happened is required so I used my usual pastebin – pastie.org to send the logs. But then I noticed that the “Raw” link in it doesn’t provide an actual raw file anymore. What the fuck. It is now a html disguised as txt.
So I decided to whip up a new pastebin (because the world need one more pastebin) which doesn’t have any actual features (like tag highlighting, etc). I also learned the way to create shortest RESTful path possible (read: ‘/’).
There may or may not be more features coming. Developed in Rubinius because I can. Using mysql because of where it’ll be deployed at (see below).
I’ll get around deploying this soon after reinstalling VPS running this blog to Ubuntu or Debian. Running yum in a 128 MB box is suffering.
[ Source Code ]
(main purpose of this post is to link this “server error” page of rubygems.org)
The relevant issue in Rails Issue Tracker (3789). AFAICT, there are few ways to “fix” (read: workaround) this:
Well, they all sucks. Hopefully someone comes up with actual working solution for this.
Oh, there’re another solutions:
Um, yeah.
Update: I figured out how to “fix” it. Check it out in Moebooru (requires this).
Be careful when using read_multi with dalli: it may return nil-valued key instead of the correct key.
The issue is tracked here and thanks to this I dropped the read_multi usage in moebooru and used the much simpler (and most likely slower) single fetch (per entry) instead. There’s alternative way to use it – do a read_multi and refetch whatever missing/nil-keyed but apparently I’m too lazy to do it.
Due to NIH syndrome and Drepper being Drepper, the only remotely secure password hashing algorithm in RHEL5/6 is multi-rounds SHA512. The default is just salted SHA512 which sucks.
Also applies to CentOS, ScientificLinux, and other RHEL clones.
Anyway, to update the default setting, these files need updating:
/etc/login.defs: add new line SHA_CRYPT_MIN_ROUNDS 5000/etc/pam.d/system-auth-ac: find line with `password sufficient pam_unix.so sha512` and append rounds=5000.Note that the change to last file may or may not be persistent. I have no idea how to properly set it up.
Finally, run this command: authconfig --updateall.
If you’re using RHEL5, run authconfig --passalgo=sha512 --update first.
Finally reached the goal: Rails 3.2.6. The isn’t much change between 3.1 and 3.2 which is why I skipped 3.1. As there isn’t much front-end change, it means there isn’t any user-visible changes. Or at least there shouldn’t be.
Plans:
3.2.0 has been branched and currently running on some servers. The next version, 3.2.1 is on default branch and being tested on moe.myconan.net. As (finally) there are database changes, it will not be tested directly on live servers until it is stable enough.
Changes include better support for JRuby, use mini_magick instead of custom plug-in, less monkey-patches (but more bugs), and various clean-ups.
Steps to be into Rails in subdirectory:
Update config.ru to understand the subdirectory mapping:
run Moebooru::Application
change to
map (ENV['RAILS_RELATIVE_URL_ROOT'] || '/') do run Moebooru::Application end
And then start Rails with correct environment variable (example if you use Unicorn):
RAILS_RELATIVE_URL_ROOT='/img' bin/unicorn
And that’s it. No need to mess with routes.rb as I previously thought after searching and experimenting for few hours. Links etc are properly generated with correct prefix. Or at least based on my quick testing.
May or may not work with earlier version(s) as I haven’t bothered to test it anywhere else.
A lightweight series which cover one or more generals (female version, obviously) from Sengoku period who have been thrown into modern time. Basically yet another moefied historical figures anime.
What’s mind-blowing is the fact that it will be a 2-cours (26 episodes according to Wikipedia) anime. Like, how is it even possible? (perhaps because it’s produced by Brain’s Base?)
Its first opening theme (and ending) is awesome (read: fun) though.
As per title, I added my own reference of basic tasks after installing Ubuntu Server.
Configuring mail system is annoying. There are quite a bit different components which must be configured to work together.
My main choice for mail system is dovecot/postfix. As I don’t really understand how all this thing goes, I may have missed or misunderstood some parts. Or most of them. Feel free to correct this post.
For starter, most of basic configurations for Postfix and Dovecot has already been done by Ubuntu (or Debian) default configuration which includes enabling IMAP and TLS.
LDA (or MDA) delivers received mails to correct user and location. I let dovecot handle this thing because it’s easier this way. In /etc/postfix/main.cf:
mailbox_command = /usr/lib/dovecot/dovecot-lda -f "$SENDER" -a "$RECIPIENT"
[ Source ]
And that’s about it.
The Mailbox format. The alternatives are mbox (ancient, shouldn’t be used anymore, I believe), or dbox (Dovecot only), or some other formats (which I don’t really care about). So basically I go with Maildir.
/etc/dovecot/conf.d/10-mail.conf:
mail_location = maildir:~/Maildir
[ Source ]
The last one, Postfix authentication. I use Dovecot SASL because it’s easier.
/etc/postfix/main.cf:
smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth smtpd_sasl_auth_enable = yes smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
/etc/dovecot/conf.d/10-master.conf:
unix_listener /var/spool/postfix/private/auth {
mode = 0666
}
[ Source ]
For Dovecot config, it’s usually already in there, one just uncomment it to enable.
Restart Dovecot and Postfix, and that’s it. As I mentioned before, Ubuntu has preconfigured many things which leaves me only few additional tasks to be done to enable simple mail system (with TLS, IMAP, and whatnot).
Protip: use Google Apps or Live Domain instead of managing your own mail server.
I’ll put it here for my own reference:
def self.slow_has_all_tags(tags)
p = Post.scoped
pt = PostsTag.arel_table
pt_arels = []
tags.each do |t|
t_id = Tag.where(:name => t).first[:id]
pt_arels << pt.where(pt[:tag_id].eq(t_id)).project(pt[:post_id])
end
pt_arels.each do |q|
p = p.where(:id => q)
end
p
end
And in fact, relatively fast.
Took me few weeks to find out that this one-liner does wonder:
echo manual >> /etc/init/mysql.override
(the line above is to disable mysql, obviously. And must be done as root)
The answer is on first hit (as of this post’s writing) of googling “ubuntu disable service” but you need to scroll down a bit and ignore shitload of crappy, outdated explanations to find that small gem.
Unfortunately doesn’t apply to previous LTS. Or does it?
Apparently I like using VM. Lots of them.
Only BSD and Linux though. And maybe SunOS and Minix sometime later this month if I feel like it.
After working on it for several weeks, finally it got to the point where it’s relatively usable. No more Bundler-on-Rails2 evilry and the fact that 3.0 branch is still supported.
The best part is the one above. Yes, Moebooru now runs on Rubinius/Puma. The only foreseeable problem is it uses Process.pid on file uploads which, when several people uploading (or working with) files at same time, the temporary filename will collide.
Though due to me aiming more for workable implementation instead of correct implementation, there are quite a lot legacy stuff still in there:
On the brighter side, now I can start cleaning up the code. Or upgrade all the way to Rails 3.2 ( ¬‿¬)
Um, yeah. Running Unicorn on DFBSD (in VMware) caused kernel panic. I have no idea why.
There’s a problem with nested query I previously mentioned: query time is unstable. The worst case is at least as slow as multiple self-join method – when the first few search key result is too big.
While digging more into the code called “Moebooru” which was forked from “Danbooru”, I noticed this:
def self.included(m)
m.extend(ClassMethods)
m.after_create :increment_count
m.after_destroy :decrement_count
end
def increment_count
connection.execute("update table_data set row_count = row_count + 1 where name = 'users'")
end
def decrement_count
connection.execute("update table_data set row_count = row_count - 1 where name = 'users'")
end
Counting takes ages, right. Except it is not. I’ve done this, yes, but on a table with 10+ millions of data (this one has ~400k in mainline danbooru), with multiple data inserted (this one got, uh, one every other week?) and queried every second (see below), and with the required count method not a simple select count(1) on some_table (which is what the example above used for).
The best part? It’s only used once, when user registers:
def set_role
if User.fast_count == 0
self.level = CONFIG["user_levels"]["Admin"]
elsif CONFIG["enable_account_email_activation"]
self.level = CONFIG["user_levels"]["Unactivated"]
else
self.level = CONFIG["starting_level"]
end
self.last_logged_in_at = Time.now
end
I haven’t been able to work on Moebooru for most of this month but I got to work on it this weekend. At ~30 changes, it went from -alpha to -beta.2 after receiving good amount of tests.
Summary of changes (more or less):
This afternoon I experimented with tag searching. Current implementation doesn’t scale beyond 6 tags due to parsing requirement. You can argue about binding variable all day but in the end it can be abused easily if the limit is lifted.
Continue readingI’m setting up cron job for a storage server using ZFS. There’s zpool status -x but it returns “all pools are healthy” (or “no pools available”) on no error and prints errors to stdout (instead of stderr), rendering it annoying for cron job.
#!/bin/sh
set -e
set -u
zstatus="`zpool status -x 2>&1`"
case "${zstatus}" in
"all pools are healthy"|"no pools available")
return 0
;;
*)
printf "%sn" "${zstatus}" >&2
return 1
;;
esac
Put it in a file (e.g. /root/bin/zpool-status-cron), make it executable, and add it to crontab.
A metaseries on Super Sentai. In short, they opened tvtropes and jammed as many tropes as they can into the series.
Head over to Over-Time to grab the releases (currently 2 episodes). Don’t forget to read the notes, too! I wish more fansubbers do this for reference-heavy series.
I’m pretty sure “Nijiyome” there is abbreviation of “nijigen yome” (2D waifu).
I think my sanity actually goes up in this one
Demo movie for Supipara – minori’s latest game/series is out. No high quality video in sight though. And the animation isn’t by Shinkai – just like eden (and I suspect we’ll get no more minori/Shinkai combo) but still pretty enough so it’s okay.
As expected, there’s no male in sight. The game is all-ages though so we won’t get some actual yuri action either 🙁
[ Link to video ]
I wonder what they are...
One of the hyped series for this season, spring 2012. Looks quite good. With Sunrise as production studio, I can safely expect stable animation over the series. No clear indication on how long this will be though considering the amount of its LN, I guess half-assed ending should be expected.
And yes, Black Snow Princess (aka Kuroyukihime) makes up 90+% of reason I’m watching this as of currently :>
Finally ;_;
The overall cost went through the roof because I forgot to calculate the handling fee. The total is 6000 JPY + 217k IDR (about 1mil IDR). Should’ve bought three of them to reduce shipping fee overhead.
Well, not too bad as this is my first amazon.jp purchase. Perhaps I should try using alternative store with cheaper shipping cost sometime later. Or next year once my life settles down again.
All right, I’ve finished most of Winter 2012 (I count the start of year from Winter by the way). And, um, I’m not sure where to start so I guess I’ll make it point by point for each series.
Continue reading
Best part of the show
Anyway, it ended quite nicely. The premise was simple and mostly solved by the end of this series. Another series done well by david production – too bad they aren’t doing anything (or at least as the main production team) for this (next) season. Oh well, hopefully we’ll get more interesting series from them sometime in the future.
So long, Shana ;_;
The first series I mostly download by myself. On weekly basis. Checking the tracker on release day back when there’s no Google Reader and TokyoTosho (or perhaps there were but I didn’t use them at the time).
I got to know Kugimin and learned term “tsundere”. Also light novels. Also Itou Noizi. Also system administration (guess how it’s related).
First season was a blast. Second season was pretty much content-less and the series of OVA didn’t add anything meaningful. Despite of them, the third – final – series certainly didn’t disappoint. Lots of things I liked on first series are back except Shana’s tsundere-ness thanks to her being much more honest than ever. Not that I hate it.
Also, great job, Eclipse (point-blank, anyone?). May the time come when I can buy the entire series’ Blu-Ray (or DVD?) – hopefully in R2.
Since I forgot to branch the original source, the branching looked awesomely crappy. Therefore I decided to rebase entire thing to ease up keeping track with Moebooru “mainline”. All my commits are now in branch “default”. If you didn’t do any change, backout up to revision 9174b6b5b02d and then pull again. And then, don’t ever touch moe branch again anymore.
