Estoy experimentando un problema extraño con un script de tejido que estoy usando para iniciar un servidor en EC2.
Lanzo una AMI estándar de Ubuntu 12.04 (ami-3d4ff254), espero a que se inicie y luego procedo con:
with settings(host_string="ubuntu@%s" % i.dns_name,
connection_attempts=30):
sudo('apt-get -qy update')
sudo('apt-get -qy install --no-install-recommends mdadm') # don't install postfix
#etc...
Parece apt-get updatefuncionar bien y no da errores, sin embargo (2/3 de las veces aproximadamente) la instalación mdadmarroja un error de "no hay candidato a instalación".
Cuando entro al servidor y lo ejecuto, apt-get install mdadmaparece el mismo error. Al ejecutarlo apt-get updatemanualmente, el paquete se instala bien.
¿Alguna idea sobre lo que podría estar sucediendo o ideas para depurar?
EDITAR: Resulta que al agregar un sleep(10)después de que aparece el servidor SSH y antes de intentarlo, apt-get updatefunciona bien. Esto parece ser un problema con la configuración de apt en esta AMI combinado con quizás alguna extrañeza por parte de Amazon o problemas de DNS.
Aquí están mis entradas en /etc/apt/sources.list:
deb http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise main
deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise main
deb http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates main
deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates main
deb http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise universe
deb http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://us-east-1.ec2.archive.ubuntu.com/ubuntu/ precise-updates universe
deb http://security.ubuntu.com/ubuntu precise-security main
deb-src http://security.ubuntu.com/ubuntu precise-security main
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
Aquí está el resultado de lo apt-get updateque arruina mi mdadminstalación:
Ign http://security.ubuntu.com precise-security InRelease
Get:1 http://security.ubuntu.com precise-security Release.gpg [198 B]
Ign http://archive.ubuntu.com precise InRelease
Get:2 http://security.ubuntu.com precise-security Release [49.6 kB]
Ign http://archive.ubuntu.com precise-updates InRelease
Hit http://archive.ubuntu.com precise Release.gpg
Get:3 http://archive.ubuntu.com precise-updates Release.gpg [198 B]
Hit http://archive.ubuntu.com precise Release
Get:4 http://security.ubuntu.com precise-security/main amd64 Packages [177 kB]
Get:5 http://archive.ubuntu.com precise-updates Release [49.6 kB]
Hit http://archive.ubuntu.com precise/main amd64 Packages
Hit http://archive.ubuntu.com precise/restricted amd64 Packages
Hit http://archive.ubuntu.com precise/universe amd64 Packages
Hit http://archive.ubuntu.com precise/multiverse amd64 Packages
Hit http://archive.ubuntu.com precise/main i386 Packages
Hit http://archive.ubuntu.com precise/restricted i386 Packages
Hit http://archive.ubuntu.com precise/universe i386 Packages
Hit http://archive.ubuntu.com precise/multiverse i386 Packages
Get:6 http://security.ubuntu.com precise-security/restricted amd64 Packages [3,969 B]
Hit http://archive.ubuntu.com precise/main TranslationIndex
Get:7 http://security.ubuntu.com precise-security/universe amd64 Packages [48.6 kB]
Hit http://archive.ubuntu.com precise/multiverse TranslationIndex
Get:8 http://security.ubuntu.com precise-security/multiverse amd64 Packages [2,188 B]
Get:9 http://security.ubuntu.com precise-security/main i386 Packages [183 kB]
Hit http://archive.ubuntu.com precise/restricted TranslationIndex
Get:10 http://archive.ubuntu.com precise/universe TranslationIndex [2,922 B]
Get:11 http://archive.ubuntu.com precise-updates/main amd64 Packages [405 kB]
Get:12 http://security.ubuntu.com precise-security/restricted i386 Packages [3,968 B]
Get:13 http://security.ubuntu.com precise-security/universe i386 Packages [48.7 kB]
Get:14 http://security.ubuntu.com precise-security/multiverse i386 Packages [2,357 B]
Get:15 http://security.ubuntu.com precise-security/main TranslationIndex [73 B]
Get:16 http://security.ubuntu.com precise-security/multiverse TranslationIndex [71 B]
Get:17 http://security.ubuntu.com precise-security/restricted TranslationIndex [71 B]
Get:18 http://security.ubuntu.com precise-security/universe TranslationIndex [73 B]
Get:19 http://archive.ubuntu.com precise-updates/restricted amd64 Packages [8,215 B]
Get:20 http://archive.ubuntu.com precise-updates/universe amd64 Packages [149 kB]
Get:21 http://security.ubuntu.com precise-security/main Translation-en [86.5 kB]
Get:22 http://archive.ubuntu.com precise-updates/multiverse amd64 Packages [8,948 B]
Hit http://security.ubuntu.com precise-security/multiverse Translation-en
Get:23 http://archive.ubuntu.com precise-updates/main i386 Packages [410 kB]
Hit http://security.ubuntu.com precise-security/restricted Translation-en
Get:24 http://security.ubuntu.com precise-security/universe Translation-en [30.3 kB]
Get:25 http://archive.ubuntu.com precise-updates/restricted i386 Packages [8,218 B]
Get:26 http://archive.ubuntu.com precise-updates/universe i386 Packages [149 kB]
Get:27 http://archive.ubuntu.com precise-updates/multiverse i386 Packages [9,930 B]
Get:28 http://archive.ubuntu.com precise-updates/main TranslationIndex [3,564 B]
Get:29 http://archive.ubuntu.com precise-updates/multiverse TranslationIndex [2,605 B]
Get:30 http://archive.ubuntu.com precise-updates/restricted TranslationIndex [2,461 B]
Get:31 http://archive.ubuntu.com precise-updates/universe TranslationIndex [2,850 B]
Get:32 http://archive.ubuntu.com precise/main Translation-en [726 kB]
Get:33 http://archive.ubuntu.com precise/multiverse Translation-en [93.4 kB]
Get:34 http://archive.ubuntu.com precise/restricted Translation-en [2,395 B]
Get:35 http://archive.ubuntu.com precise/universe Translation-en [3,341 kB]
Get:36 http://archive.ubuntu.com precise-updates/main Translation-en [202 kB]
Get:37 http://archive.ubuntu.com precise-updates/multiverse Translation-en [5,606 B]
Get:38 http://archive.ubuntu.com precise-updates/restricted Translation-en [2,048 B]
Get:39 http://archive.ubuntu.com precise-updates/universe Translation-en [87.4 kB]
Ign http://archive.ubuntu.com precise/main Translation-en_US
Ign http://archive.ubuntu.com precise/multiverse Translation-en_US
Ign http://archive.ubuntu.com precise/restricted Translation-en_US
Fetched 6,308 kB in 8s (786 kB/s)
Reading package lists...
Y aquí está el resultado del que funciona (es decir, después de esperar unos segundos antes de realizar el apt-get update):
Ign http://us-east-1.ec2.archive.ubuntu.com precise InRelease
Ign http://us-east-1.ec2.archive.ubuntu.com precise-updates InRelease
Get:1 http://us-east-1.ec2.archive.ubuntu.com precise Release.gpg [198 B]
Get:2 http://us-east-1.ec2.archive.ubuntu.com precise-updates Release.gpg [198 B]
Get:3 http://us-east-1.ec2.archive.ubuntu.com precise Release [49.6 kB]
Ign http://security.ubuntu.com precise-security InRelease
Get:4 http://us-east-1.ec2.archive.ubuntu.com precise-updates Release [49.6 kB]
Get:5 http://security.ubuntu.com precise-security Release.gpg [198 B]
Get:6 http://us-east-1.ec2.archive.ubuntu.com precise/main Sources [934 kB]
Get:7 http://security.ubuntu.com precise-security Release [49.6 kB]
Get:8 http://us-east-1.ec2.archive.ubuntu.com precise/universe Sources [5,019 kB]
Get:9 http://us-east-1.ec2.archive.ubuntu.com precise/main amd64 Packages [1,273 kB]
Get:10 http://security.ubuntu.com precise-security/main Sources [50.1 kB]
Get:11 http://us-east-1.ec2.archive.ubuntu.com precise/universe amd64 Packages [4,786 kB]
Get:12 http://security.ubuntu.com precise-security/universe Sources [14.5 kB]
Get:13 http://security.ubuntu.com precise-security/main amd64 Packages [177 kB]
Get:14 http://us-east-1.ec2.archive.ubuntu.com precise/main i386 Packages [1,274 kB]
Get:15 http://security.ubuntu.com precise-security/universe amd64 Packages [48.6 kB]
Get:16 http://us-east-1.ec2.archive.ubuntu.com precise/universe i386 Packages [4,796 kB]
Get:17 http://security.ubuntu.com precise-security/main i386 Packages [183 kB]
Get:18 http://us-east-1.ec2.archive.ubuntu.com precise/main TranslationIndex [3,706 B]
Get:19 http://us-east-1.ec2.archive.ubuntu.com precise/universe TranslationIndex [2,922 B]
Get:20 http://us-east-1.ec2.archive.ubuntu.com precise-updates/main Sources [178 kB]
Get:21 http://security.ubuntu.com precise-security/universe i386 Packages [48.7 kB]
Get:22 http://us-east-1.ec2.archive.ubuntu.com precise-updates/universe Sources [60.2 kB]
Get:23 http://security.ubuntu.com precise-security/main TranslationIndex [73 B]
Get:24 http://us-east-1.ec2.archive.ubuntu.com precise-updates/main amd64 Packages [405 kB]
Get:25 http://us-east-1.ec2.archive.ubuntu.com precise-updates/universe amd64 Packages [149 kB]
Get:26 http://security.ubuntu.com precise-security/universe TranslationIndex [73 B]
Get:27 http://security.ubuntu.com precise-security/main Translation-en [86.5 kB]
Get:28 http://security.ubuntu.com precise-security/universe Translation-en [30.3 kB]
Get:29 http://us-east-1.ec2.archive.ubuntu.com precise-updates/main i386 Packages [410 kB]
Get:30 http://us-east-1.ec2.archive.ubuntu.com precise-updates/universe i386 Packages [149 kB]
Get:31 http://us-east-1.ec2.archive.ubuntu.com precise-updates/main TranslationIndex [3,564 B]
Get:32 http://us-east-1.ec2.archive.ubuntu.com precise-updates/universe TranslationIndex [2,850 B]
Get:33 http://us-east-1.ec2.archive.ubuntu.com precise/main Translation-en [726 kB]
Get:34 http://us-east-1.ec2.archive.ubuntu.com precise/universe Translation-en [3,341 kB]
Get:35 http://us-east-1.ec2.archive.ubuntu.com precise-updates/main Translation-en [202 kB]
Get:36 http://us-east-1.ec2.archive.ubuntu.com precise-updates/universe Translation-en [87.4 kB]
Fetched 24.6 MB in 12s (1,976 kB/s)
Reading package lists...
No sé por qué el primero está lleno de más Hits y Igns.
Respuesta1
Sin algunas pruebas más profundas (que no voy a hacer ahora) es difícil decirexactamentelo que está pasando, pero el esquema general es:
Cuando inicia por primera vez una instancia en la nube de Ubuntu en EC2, se ejecuta un script que la personaliza un poco para el entorno EC2. Una de las cosas que sucede es que /etc/apt/sources.listse reescribe para que apunte a las réplicas de Ubuntu que están alojadas en Amazon S3 (lo que significa que no paga costos de ancho de banda para instalar/actualizar el software).
Supongo que hay algo sutilmente diferente entre los archivos de Amazon y los archivos generales, lo que causa la extrañeza que estás viendo; Con un poco más de pruebas y hurgando, probablemente descubrirás exactamente qué es.
Mi sugerencia para que su script de implementación funcione sería simplemente esperar hasta que se completen todas las tareas de inicialización de Ubuntu antes de ejecutar su propio script.