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Revert to a previous Boot Environment - Solaris 11

Revert to a previous Boot Environment:

beadm list
beadm activate solaris-backup-1
reboot

How to set CentOS/Redhat to auto update

# yum update -y
# yum install yum-cron
# chkconfig yum-cron on

Unattended Updates - Debian

To set up auto updates on Debian, do the following:

apt-get install unattended-upgrades apt-listchanges

Edit /etc/apt/apt.conf.d/50unattended-upgrades and uncomment the line:

Unattended-Upgrade::Mail "root";

Edit /etc/apt/apt.conf.d/20auto-upgrades, and add the following:

APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";

Or run the following command as root:

dpkg-reconfigure -plow unattended-upgrades

Creating an encrupted password for kickstart - CentOS

Use OpenSSL to generate an MD5 crypt:

# openssl passwd -1 "password here"
$1$e/5d7DEs$bhFiuOQp8MMe785dzvBPv.

Use grub-crypt to generate a SHA256 crypt:

# grub-crypt --sha-256
Password:
Retype password:
$5$W/DyB05xk2UIZz6k$YyBl36yKHVmaFmJHNS1m/b2/viRa6KnQe3dDQVZZ5n3

Put the password hash in your kickstart file:

rootpw --iscrypted password_hash

Make sure your authconfig configuration matches the crypt:

authconfig --enableshadow [--enablemd5|--passalgo=sha256]

INIT: Id “1” respawning too fast: disabled for 5 minutes

Console error message:

INIT: Id “1” respawning too fast: disabled for 5 minutes

What causes this problem? Apparently, this is due to this line in my /etc/inittab file:

1:2345:respawn:/sbin/getty 38400 tty1

Which says to spawn a terminal on a non existant serial port. You get a respawning too fast error when an inittab line makes no sense. So simptly comment it out:

#1:2345:respawn:/sbin/getty 38400 tty1

Puppet List Installed Modules - Install non Puppetforge modules

To list Puppet modules downloaded from puppetforge:

# puppet module list
/etc/puppet/modules
├── adrien-alternatives (v0.3.0)
├── alkivi-console_data (v0.0.1)
├── attachmentgenie-locales (v1.0.6)
├── example42-puppi (v2.1.10)
├── herculesteam-augeasproviders_core (v2.0.1)
├── herculesteam-augeasproviders_shellvar (v2.0.1)
├── pfmooney-mit_krb5 (v0.0.5)
├── puppetlabs-concat (v1.0.0)
├── puppetlabs-firewall (v1.2.0)
├── puppetlabs-inifile (v1.2.0)
├── puppetlabs-ntp (v3.3.0)
├── puppetlabs-stdlib (v4.3.2)
├── saz-ssh (v2.4.0)
├── ssm-munin (v0.0.5)
├── stahnma-epel (v1.0.2)
├── trlinkin-nsswitch (v1.0.0)
└── trlinkin-validate_multi (v0.1.0)

To install modules from elsewhere:

cd /var/tmp
wget https://github.com/lermit/puppet-nslcd/archive/master.zip
cd /etc/puppet/environments/testing/
unzip /var/tmp/master.zip