dotCloud and go

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dotCloud and go UnaBreve Introduzione a DotCloud 1

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L’immancabile esempio 2

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dove lo metto? 10

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COME lo metto? 11

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QUANTO TEMPO CI METTO? 12

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dotCloud 13

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IaaS - PaaS- SaaS 15

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IaaS - PaaS- SaaS 15

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dotcloud 20

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easy_install 21

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Easy Install èun modulo python (easy_install) incluso in setuptools che vi consente di scaricare ed installare automaticamente pacchetti Python. 22

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Easy Install èun modulo python (easy_install) incluso in setuptools che vi consente di scaricare ed installare automaticamente pacchetti Python. 23

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Sì, Python 24

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(è il motivoper cui queste slide sono nere) 25

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Python 2.7 27

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$ dotcloud createwhatever Created application "whatever" 29

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$ cat dotcloud.yml www: type: perl approot: www backend: type: perl-worker approot: backend nosqldb: type: redis sqldb: type: mysql 31

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$ cat dotcloud.yml www: type: perl approot: www backend: type: perl-worker approot: backend nosqldb: type: redis sqldb: type: mysql 32

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$ cat dotcloud.yml www: type: perl approot: www backend: type: perl-worker approot: backend nosqldb: type: redis sqldb: type: mysql 33

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type: perl 34

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$ cat app.psgi #!/usr/bin/envperl use Dancer; use whatever; dance(); 35

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$ cat Makefile.PL ... PREREQ_PM => { 'Test::More' => 0, 'YAML' => 0, 'Dancer' => 1.3070, 'Plack::Request' => 0, 'Template' => 0, 'JSON' => 0, 'Redis' => 0, ... }, ... 36

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type: perl-worker 37

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$ cat supervisord.conf [program:exporter] command= perl /home/dotcloud/current/bin/exporter [program:saver] command = perl /home/dotcloud/current/bin/saver 38

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$ cat supervisord.conf [program:exporter] command= perl /home/dotcloud/current/bin/exporter [program:saver] command = perl /home/dotcloud/current/bin/saver 39

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$ cat supervisord.conf [program:exporter] command= perl /home/dotcloud/current/bin/exporter [program:saver] command = perl /home/dotcloud/current/bin/saver 40

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$ cat dotcloud.yml www: type: perl approot: www backend: type: perl-worker approot: backend nosqldb: type: redis sqldb: type: mysql 41

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Connettersi 42

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$ cat /home/dotcloud/environment.yml DOTCLOUD_ENVIRONMENT:default DOTCLOUD_NOSQLDB_REDIS_HOST: whatever-polettix.dotcloud.com DOTCLOUD_NOSQLDB_REDIS_LOGIN: redis DOTCLOUD_NOSQLDB_REDIS_PASSWORD: ... DOTCLOUD_NOSQLDB_REDIS_PORT: '13749' DOTCLOUD_NOSQLDB_REDIS_URL: ... DOTCLOUD_PROJECT: whatever DOTCLOUD_SERVICE_ID: 0 DOTCLOUD_SERVICE_NAME: www DOTCLOUD_SQLDB_MYSQL_HOST: whatever-polettix.dotcloud.com DOTCLOUD_SQLDB_MYSQL_LOGIN: root DOTCLOUD_SQLDB_MYSQL_PASSWORD: ... DOTCLOUD_SQLDB_MYSQL_PORT: '13747' DOTCLOUD_SQLDB_MYSQL_URL: ... 44

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use JSON qw<from_json >; use File::Slurp qw< read_file >; sub get_dotcloud_config { my $filename = shift || '/home/dotcloud/environment.json'; my $config_text = read_file($filename); my $config = from_json($config_text); return $config; } ## end sub get_dotcloud_config 45

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sub get_redis { my $config = get_dotcloud_config(); my ($password, $hostname, $port) = map { $config->{'DOTCLOUD_NOSQLDB_REDIS_' . $_} } qw< PASSWORD HOST PORT >; require Redis; my $redis = Redis->new(server => "$hostname:$port"); $redis->auth($password); return $redis; } 46

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ROTFL sub get_redis { my $config = get_dotcloud_config(); my ($password, $hostname, $port) = map { $config->{'DOTCLOUD_NOSQLDB_REDIS_' . $_} } qw< PASSWORD HOST PORT >; require Redis; my $redis = Redis->new(server => "$hostname:$port"); $redis->auth($password); return $redis; } 47

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(mi basta poco) 48

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sub get_dbh { my $config = get_dotcloud_config(); my ($username, $password, $hostname, $port) = map { $config->{'DOTCLOUD_SQLDB_MYSQL_' . $_} } qw< LOGIN PASSWORD HOST PORT >; require DBI; my $dbh = DBI->connect( "dbi:mysql:host=$hostname;port=$port" . ";database=whatever", $username, $password, { RaiseError => 1}, ); return $dbh; } 49

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use lib '/home/dotcloud/code/lib'; 52

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DotCloud::Environment 53

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ora... in produzione 55

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$ dotcloud pushwhatever # Found dotcloud.yml: Using /home/poletti/sviluppo/ perl/whatever as a base directory # upload /home/poletti/sviluppo/perl/whatever ssh:// dotcloud@uploader.dotcloud.com:443/whatever/ branch:master # git ... 2011-08-27 09:00:16 [api] Deploy whatever scheduled for revision=latest 2011-08-27 09:00:16 [api] Waiting for the build. (It may take a few minutes) 2011-08-27 09:00:17 [api] All the services are ready. Beginning the build. ... 56

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uso git 57

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potete usare mercurial 58

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oppure niente 59

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io uso git 60

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fatto 61

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$ dotcloud listwhatever whatever: - www (type: perl; instances: 1) - nosqldb (type: redis; instances: 1) - sqldb (type: mysql; instances: 1) - backend (type: perl-worker; instances: 1) $ dotcloud url whatever www: http://www.whatever.dotcloud.com/ 62

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$ dotcloud infowhatever.backend build_revision: git-b2f52d5 cluster: wolverine config: {} created_at: 1313990084.301964 image_version: b81a3f3949a8 (latest) ports: - name: ssh url: ssh://dotcloud@whatever-polettix.dotcloud.com:13750 state: running type: perl-worker 64

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telecomando: dotcloud run 65

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type: mysql $ dotcloudinfo whatever.sqldb cluster: wolverine config: mysql_password: <the-password> created_at: 1313990083.324873 ... $ dotcloud run whatever.sqldb -- mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or g. ... mysql> CREATE TABLE weight (... 66

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troubleshooting? 67

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dotcloud logs (Luke!) 68

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$ dotcloud logswhatever.backend # tail -F /var/log/supervisor/*.log ==> /var/log/supervisor/exporter-stderr---supervisor-2y6P9O.log <== [2011/08/27 01:35:25 INFO ] serving pending requests if needed... [2011/08/27 01:35:25 INFO ] waiting for more export requests... [2011/08/27 01:39:20 INFO ] serving pending requests if needed... [2011/08/27 01:39:20 INFO ] waiting for more export requests... [2011/08/27 01:39:42 INFO ] got element to export: {"email":"flavio@polettix.it","username":"silvia"} [2011/08/27 01:42:18 INFO ] serving pending requests if needed... [2011/08/27 01:42:18 INFO ] waiting for more export requests... [2011/08/27 01:42:30 INFO ] got element to export: {"email":"flavio@polettix.it","username":"silvia"} [2011/08/27 09:00:24 INFO ] serving pending requests if needed... [2011/08/27 09:00:24 INFO ] waiting for more export requests... ==> /var/log/supervisor/exporter-stdout---supervisor-foI5vi.log <== ==> /var/log/supervisor/saver-stderr---supervisor-pt1_hK.log <== [2011/08/27 01:35:25 INFO ] waiting for more data... [2011/08/27 01:36:04 INFO ] got element to save: {"epoch":1313913600,"weight":83200,"username":"flavio"} [2011/08/27 01:37:25 INFO ] got element to save: {"epoch":1313827200,"weight":62000,"username":"silvia"} [2011/08/27 01:39:20 INFO ] performing initial transfer if needed... [2011/08/27 01:39:20 INFO ] waiting for more data... [2011/08/27 01:42:18 INFO ] performing initial transfer if needed... [2011/08/27 01:42:18 INFO ] waiting for more data... [2011/08/27 01:44:04 INFO ] got element to save: {"epoch":1313913600,"weight":78000,"username":"whatever"} [2011/08/27 09:00:24 INFO ] performing initial transfer if needed... [2011/08/27 09:00:24 INFO ] waiting for more data... ==> /var/log/supervisor/saver-stdout---supervisor-iQDgpA.log <== ==> /var/log/supervisor/supervisord.log <== 2011-08-27 01:42:18,703 INFO spawned: 'saver' with pid 19587 2011-08-27 01:42:18,713 INFO spawned: 'exporter' with pid 19588 2011-08-27 01:42:19,914 INFO success: saver entered RUNNING state, process has stayed up for > than 1 seconds (startsecs) 2011-08-27 01:42:19,943 INFO success: exporter entered RUNNING state, process has stayed up for > than 1 seconds (startsecs) 2011-08-27 09:00:22,067 INFO stopped: saver (terminated by SIGTERM) 2011-08-27 09:00:22,070 INFO stopped: exporter (terminated by SIGTERM) 2011-08-27 09:00:24,079 INFO spawned: 'saver' with pid 19729 2011-08-27 09:00:24,086 INFO spawned: 'exporter' with pid 19730 2011-08-27 09:00:25,426 INFO success: saver entered RUNNING state, process has stayed up for > than 1 seconds (startsecs) 2011-08-27 09:00:25,426 INFO success: exporter entered RUNNING state, process has stayed up for > than 1 seconds (startsecs) 69

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PIÙ troubleshooting? 70

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dotcloud run (like hell) 71

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$ dotcloud runwhatever.www -- ps afx # ps afx PID TTY STAT TIME COMMAND 3558 ? S 0:00 sshd: dotcloud@pts/0 3559 pts/0 Rs+ 0:00 _ ps afx 144 ? Ss 0:44 /usr/bin/python /usr/ 3495 ? S 0:00 _ /usr/local/bin/uwsg 3496 ? S 0:00 _ /usr/local/bin/ 72

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ANCORA PIÙ troubleshooting? 73

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dotcloud ssh 74

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dotcloud ssh (noroot, sorry!) 75

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$ dotcloud sshwhatever.backend # $SHELL dotcloud@whatever-default-backend-0:~$ $ dotcloud ssh whatever.nosqldb # $SHELL redis@whatever-default-nosqldb-0:~$ redis-cli redis> auth ... OK redis> smembers users 1) "silvia" 2) "flavio" 3) "whatever" 76

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$ git commit 78

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OPPURE 79

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$ dotcloud push--all whatever 80

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$ dotcloud pushwhatever -b branch 81

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