1
00:00:00,310 --> 00:00:03,690
With the app deployed,
our next step is to start the web server.

2
00:00:03,690 --> 00:00:07,570
The guest book app is set up to run
using nginx as a reverse proxy and

3
00:00:07,570 --> 00:00:09,320
unicorn as it's web server.

4
00:00:09,320 --> 00:00:10,707
We need to tweak our nginx and

5
00:00:10,707 --> 00:00:13,920
unicorn configurations
before we can start them up.

6
00:00:13,920 --> 00:00:17,220
So first I'm going to go
into my nginx config,

7
00:00:17,220 --> 00:00:21,850
which I've set up here in the config
directory under nginx.conf.

8
00:00:21,850 --> 00:00:25,720
And it's got a configuration item
that needs to point to the root

9
00:00:25,720 --> 00:00:27,180
path of our Rails app.

10
00:00:27,180 --> 00:00:32,780
That used to be home/deploy/guestbook, but
now, the Capistrano is deploying our app.

11
00:00:32,780 --> 00:00:35,960
It's going to be
home/deploy/guestbook/current.

12
00:00:35,960 --> 00:00:39,751
And then it can still refer to
the public subdirectory within that.

13
00:00:42,194 --> 00:00:46,042
Let me copy that, since we're going to
have to set up the current subdirectory

14
00:00:46,042 --> 00:00:48,310
in several other places as well.

15
00:00:48,310 --> 00:00:51,230
That's the only change we have to make for
our nginx config, though.

16
00:00:51,230 --> 00:00:57,315
I'll close out of that, now let me go into
the unicorn.rb file in the same directory.

17
00:00:57,315 --> 00:01:00,994
And we're gonna change
all the occurrences of

18
00:01:00,994 --> 00:01:06,569
home/deploy/guestbook to
home/deploy/guestbook/current.

19
00:01:08,238 --> 00:01:11,390
All the sub directories can
remain the same however.

20
00:01:11,390 --> 00:01:16,640
Lastly, I've added a shell script here in
config unicorn_init.sh that can start,

21
00:01:16,640 --> 00:01:18,820
stop, or restart unicorn for us.

22
00:01:18,820 --> 00:01:22,750
See the teacher's notes if you'd like to
set up a copy of this script for yourself.

23
00:01:22,750 --> 00:01:23,851
At the top of the script,

24
00:01:23,851 --> 00:01:26,801
there's a bunch of environment
variables that can be custified.

25
00:01:30,214 --> 00:01:33,925
So we just need to set the APP_ROOT
variable to point to the path on

26
00:01:33,925 --> 00:01:36,350
the server where our app is installed.

27
00:01:36,350 --> 00:01:43,060
We're going to point it to the same
location that we did in nginx.com for

28
00:01:43,060 --> 00:01:49,560
the unicorn.rb,
home/deploy/guestbook/current.

29
00:01:49,560 --> 00:01:51,008
So I've saved all these files.

30
00:01:53,637 --> 00:01:59,077
And I'm gonna commit all of them to git,

31
00:01:59,077 --> 00:02:03,399
git add config/nginx.conf,

32
00:02:03,399 --> 00:02:08,201
git add config/unicorn.rb, and

33
00:02:08,201 --> 00:02:13,495
git add config/ unicorn_init.sh.

34
00:02:18,637 --> 00:02:24,035
Commit them with the message
update paths in configuration.

35
00:02:26,526 --> 00:02:30,843
And then I'm gonna push that commit
out to our remote repository so

36
00:02:30,843 --> 00:02:33,940
that we can deploy it to
our production server.

37
00:02:36,700 --> 00:02:39,240
Now, let's run a Capistrano
deployment again, but

38
00:02:39,240 --> 00:02:42,460
not to deploy initial,
this is going to be a subsequent deploy.

39
00:02:42,460 --> 00:02:45,128
So, bundle exec cap production deploy.

40
00:02:47,814 --> 00:02:50,229
Okay, and with our deployment complete,

41
00:02:50,229 --> 00:02:53,990
the updated configuration
files are setup on the server.

42
00:02:53,990 --> 00:02:57,200
Now we need to just link them
into the places that nginx and

43
00:02:57,200 --> 00:02:58,860
unicorn will actually look for them.

44
00:02:59,990 --> 00:03:02,265
So I'm going to SSH onto the server.

45
00:03:06,696 --> 00:03:11,769
And first let's set up nginx, we're going
to be altering a directory that you need,

46
00:03:11,769 --> 00:03:16,300
administrative privileges to change so
I'm going to run the sudo command.

47
00:03:16,300 --> 00:03:21,200
And using sudo, I'm going to
remove the default nginx site, so

48
00:03:21,200 --> 00:03:30,490
that's going to be stored
in etc/nginx/sites-enabled,

49
00:03:30,490 --> 00:03:35,530
and it it'll be the default
site inside that directory.

50
00:03:35,530 --> 00:03:38,082
I'll need to provide my deploy password.

51
00:03:40,501 --> 00:03:42,966
And now with the default NGINX site gone,

52
00:03:42,966 --> 00:03:46,130
we can link our custom
site into its place.

53
00:03:46,130 --> 00:03:47,880
So I'm going to run some sudo command.

54
00:03:47,880 --> 00:03:52,890
And this is going to set us up symbolic
link using the ln command with

55
00:03:52,890 --> 00:03:56,010
the dash s, command line flag.

56
00:03:56,010 --> 00:03:58,760
So first we're going to need
the path that we're linking from,

57
00:03:58,760 --> 00:04:02,460
that's gonna be our nginx configuration
within our Rails app directory.

58
00:04:02,460 --> 00:04:07,670
So that will be in
home/deploy/guestbook/current and

59
00:04:09,640 --> 00:04:14,330
then within the cofig sub directory,
nginx.conf.

60
00:04:14,330 --> 00:04:19,051
That's going to link into
the etc/nginx directory in

61
00:04:19,051 --> 00:04:26,280
the sites-enabled subdirectory, just like
the default site that we just deleted and

62
00:04:26,280 --> 00:04:29,730
I'm going to create a link within
that directory named guestbook.

63
00:04:31,840 --> 00:04:34,760
Hit Enter and
that will link our config and

64
00:04:34,760 --> 00:04:39,790
the next time we restart
nginx with sudo service

65
00:04:39,790 --> 00:04:45,260
nginx restart,
that should load our config instead.

66
00:04:45,260 --> 00:04:49,250
Next we need to insure that our unicorn
gets restarted each time the server

67
00:04:49,250 --> 00:04:49,830
restarts.

68
00:04:49,830 --> 00:04:54,410
So we're going to link it into
a directory used by services in Linux.

69
00:04:54,410 --> 00:04:59,570
We'll do that with sudo ln -s,
again we're going to

70
00:04:59,570 --> 00:05:04,970
specify our file here within
our app deployment directory.

71
00:05:04,970 --> 00:05:11,252
So
home/deploy/guestbook/current/config/unic-

72
00:05:11,252 --> 00:05:13,028
orn_init.sh.

73
00:05:13,028 --> 00:05:21,020
We're going to link that into a special
Linux directory called etc/init.d/.

74
00:05:21,020 --> 00:05:24,430
Services that run at system startup
get linked to this director.

75
00:05:24,430 --> 00:05:27,624
And we're going to create a file,

76
00:05:27,624 --> 00:05:33,033
a link within this directory
named unicorn_guestbook.

77
00:05:35,934 --> 00:05:40,232
Then we need to tell our Linux system
about that new link we just created so

78
00:05:40,232 --> 00:05:43,210
that it will reload it
when the system restarts.

79
00:05:43,210 --> 00:05:47,660
So I'm going to say sudo, and

80
00:05:47,660 --> 00:05:54,257
then I'll run the command update-rc.d.

81
00:05:57,273 --> 00:06:03,131
I'll specify the name of the link we just
created, which is unicorn_guestbook.

82
00:06:07,132 --> 00:06:09,162
And I'll give it the argument defaults,

83
00:06:09,162 --> 00:06:11,950
which means that it should
run when the system restarts.

84
00:06:13,840 --> 00:06:17,280
And now, let's use that unicorn
init script to restart unicorn.

85
00:06:17,280 --> 00:06:22,400
So, I'll say sudo path to
the Rails app which is

86
00:06:22,400 --> 00:06:30,211
home/deploy/guestbook/current/config/unic-
orn_init.sh,

87
00:06:30,211 --> 00:06:35,337
and I'm going to pass
the restart subcommand.

88
00:06:39,052 --> 00:06:42,990
With nginx and unicorn configured,
our site should be up and running.

89
00:06:42,990 --> 00:06:47,934
But if we paste the IP address into our
browser, we'll we're getting a 500 error.

90
00:06:50,890 --> 00:06:52,745
So, here on the server,
let's take a look and

91
00:06:52,745 --> 00:06:54,510
see if we can figure out what's going on.

92
00:06:54,510 --> 00:06:57,550
I'm gonna take a look first
at the production logs.

93
00:07:00,370 --> 00:07:04,270
And I don't really see an error in there
that could explain what's going on.

94
00:07:04,270 --> 00:07:06,690
So, let's take a look at
the unicorn log as well.

95
00:07:07,820 --> 00:07:13,470
That's configured to write to the unicorn
subdirectory in a file called unicorn.log.

96
00:07:13,470 --> 00:07:17,180
We'll scroll down here to the bottom.

97
00:07:20,090 --> 00:07:23,850
And then if we scroll back up we'll see
the error missing secret key base for

98
00:07:23,850 --> 00:07:25,750
the production environment.

99
00:07:25,750 --> 00:07:29,740
We need to set this value
in config/secrets.yml.

100
00:07:29,740 --> 00:07:35,222
If you'll recall though,
our config/secrets.yml, Simply

101
00:07:35,222 --> 00:07:40,700
loads the production secret_key_base
value in from an environment variable.

102
00:07:40,700 --> 00:07:45,980
And if you recall our prior workshop,
we set up rbenv-vars with the intention

103
00:07:45,980 --> 00:07:51,000
that it would let us load in our
configuration variables from a file.

104
00:07:52,410 --> 00:07:56,490
But there is no rbenv-vars file
here in guessbook/current,

105
00:07:56,490 --> 00:08:00,550
we could create one here but
it'll get wiped out on the next deploy.

106
00:08:00,550 --> 00:08:06,340
So instead, we're going to switch to
the home guestbook/shared directory and

107
00:08:06,340 --> 00:08:07,730
create it there.

108
00:08:07,730 --> 00:08:11,830
The shared directory contains files that
need to be preserved between deployments.

109
00:08:11,830 --> 00:08:17,950
So first, let's change back to
the Rails app directory real quick so

110
00:08:17,950 --> 00:08:25,020
that we can run the command,
bin/rails secret.

111
00:08:25,020 --> 00:08:29,375
That'll generate a secret file that we
can set in our environment variable.

112
00:08:33,287 --> 00:08:35,760
Then we'll change back
to the shared directory.

113
00:08:39,190 --> 00:08:43,274
And we'll use the nano editor
to create an rbenv-vars file.

114
00:08:46,446 --> 00:08:50,758
Within that file, we're going to set

115
00:08:50,758 --> 00:08:56,790
the SECRET_KEY_BASE environment variable.

116
00:08:56,790 --> 00:09:02,640
We put an equal sign after the name of
the variable we want to set with no space,

117
00:09:02,640 --> 00:09:04,710
characters on either side of it.

118
00:09:04,710 --> 00:09:07,950
And then we paste in the value that we
want to set it to which is gonna be our

119
00:09:07,950 --> 00:09:08,545
secret key.

120
00:09:11,503 --> 00:09:15,440
The nano editor requires a little
o when we write the file out.

121
00:09:15,440 --> 00:09:19,670
We can print the file name we want to
write, and then we can hit CTRL X to exit.

122
00:09:19,670 --> 00:09:23,670
So now we have an rbenv-vars file that
will be preserved between deployments, but

123
00:09:23,670 --> 00:09:28,410
unfortunately it's not in the current
directory where we need it to be.

124
00:09:28,410 --> 00:09:31,484
To fix this, we're going to exit
the shell here on our server so

125
00:09:31,484 --> 00:09:33,693
that we get back to our
development machine.

126
00:09:36,967 --> 00:09:41,389
And then here in my editor,
I'm going to make a change to the config,

127
00:09:41,389 --> 00:09:42,627
deploy.rb file.

128
00:09:43,960 --> 00:09:47,010
Down here, you can see a commented
out section that's devoted

129
00:09:47,010 --> 00:09:49,540
to setting the linked files variable.

130
00:09:51,220 --> 00:09:54,400
The default value for
linked files is an empty array, and

131
00:09:54,400 --> 00:09:58,960
then here is a call to the append
method for Capistrano,

132
00:09:58,960 --> 00:10:03,710
which takes a variable and that variable
is assumed to contain an array.

133
00:10:05,220 --> 00:10:09,890
Any subsequent arguments to append
are values that are gonna get appended

134
00:10:09,890 --> 00:10:11,130
to the array.

135
00:10:11,130 --> 00:10:13,080
So since the above line is commented out,

136
00:10:13,080 --> 00:10:17,190
our linked files variable should
be completely empty already.

137
00:10:17,190 --> 00:10:22,370
We're going to make another call to
append here, and we're going to append

138
00:10:22,370 --> 00:10:29,560
to the linked_files array, and
we're going to add one value on to it.

139
00:10:29,560 --> 00:10:35,947
We want it to link a file from
the shared directory named .rbenv-vars.

140
00:10:35,947 --> 00:10:40,852
So let's save and close this, and the next
time we do a deploy, it's going to create

141
00:10:40,852 --> 00:10:45,066
a symbolic link from the shared
directory into the current directory for

142
00:10:45,066 --> 00:10:49,834
the current deploy, it'll be just like
our rbenv-vars file would sit in there in

143
00:10:49,834 --> 00:10:52,020
the current directory.

144
00:10:52,020 --> 00:10:55,929
So let's do that deploy now,
bundle exec cap

145
00:10:55,929 --> 00:11:02,150
production deploy.

146
00:11:02,150 --> 00:11:06,645
And here you can see that
it's creating a symbolic link

147
00:11:06,645 --> 00:11:11,055
from the rbenv-vars file
into the current release.

148
00:11:14,902 --> 00:11:17,625
So now with that secret key
environment variable in place,

149
00:11:17,625 --> 00:11:19,920
we should be able to
try restarting unicorn.

150
00:11:19,920 --> 00:11:25,966
Let's connect to our server via SSH, and
try re running that restart command.

151
00:11:32,958 --> 00:11:38,210
Now we'll go back to the browser, hit
reload, and we get to our guestbook app.

152
00:11:38,210 --> 00:11:41,970
Our app is successfully deployed, and
nginx and unicorn are up and running.