Difference between revisions of "OpenVZ VM First Boot Setup Tips"
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(Put to Category Proxmox VE 3.x) |
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| + | {{Note|Article about the old stable Proxmox VE 3.x releases}} | ||
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If we copy over a setup script into a VM Template during it's build, we can execute it on first boot up of it's newly created VM and on script completion we can remove the script and hence prevent it from running on subsequent boot ups. | If we copy over a setup script into a VM Template during it's build, we can execute it on first boot up of it's newly created VM and on script completion we can remove the script and hence prevent it from running on subsequent boot ups. | ||
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| + | == Introduction == | ||
| + | |||
| + | This article lists some useful oneliners especially for building OpenVZ templates using the [[Debian Appliance Builder]]. | ||
Here are some bash shell script statements that perform some common tasks that may be used in such a script (the value will be placed in a variable for example '''VAR''' and it can be used with '''${VAR}''' in the scripts): | Here are some bash shell script statements that perform some common tasks that may be used in such a script (the value will be placed in a variable for example '''VAR''' and it can be used with '''${VAR}''' in the scripts): | ||
| + | |||
| + | ====Advanced Bash Scripting Guide==== | ||
| + | Get the 2.50 MB Free eBook at: | ||
| + | http://tldp.org/LDP/abs/abs-guide.pdf | ||
====Current IP of the container==== | ====Current IP of the container==== | ||
MYIP=`ifconfig venet0:0 | grep "inet" | cut -d":" -f 2 | cut -d " " -f 1` | MYIP=`ifconfig venet0:0 | grep "inet" | cut -d":" -f 2 | cut -d " " -f 1` | ||
| + | |||
====Fully Qualified Domain Name of the container==== | ====Fully Qualified Domain Name of the container==== | ||
FQDNAME=`hostname`.`dnsdomainname` | FQDNAME=`hostname`.`dnsdomainname` | ||
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====Generate Random Password==== | ====Generate Random Password==== | ||
The following will generate a 12 character random password '''with special characters''': | The following will generate a 12 character random password '''with special characters''': | ||
| − | + | UPASSWD=`openssl rand -base64 12` | |
The following will generate a 12 character random password '''without special characters''': | The following will generate a 12 character random password '''without special characters''': | ||
| − | + | UPASSWD=`dd if=/dev/urandom count=200 bs=1 2>/dev/null|tr "\n" " "|sed 's/[^a-zA-Z0-9]//g'|cut -c-12` | |
| + | Do not use reserved keywords like '''PASSWD''', '''HOSTNAME''', etc., as userland variables, since '''squeeze''' does not like '''bashisms''' and Debian is progressing to strict '''dash''' from lenient '''bash'''.... | ||
====Generate an MD5 hash (lowercase) of a random number==== | ====Generate an MD5 hash (lowercase) of a random number==== | ||
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echo ...... and is \"`cat /root/.my.cnf | grep password | cut -d'"' -f 2`\" | echo ...... and is \"`cat /root/.my.cnf | grep password | cut -d'"' -f 2`\" | ||
| − | [[Category: | + | [[Category:Proxmox VE 3.x]] |
Latest revision as of 15:18, 13 October 2016
|
Note: Article about the old stable Proxmox VE 3.x releases |
If we copy over a setup script into a VM Template during it's build, we can execute it on first boot up of it's newly created VM and on script completion we can remove the script and hence prevent it from running on subsequent boot ups.
Introduction
This article lists some useful oneliners especially for building OpenVZ templates using the Debian Appliance Builder.
Here are some bash shell script statements that perform some common tasks that may be used in such a script (the value will be placed in a variable for example VAR and it can be used with ${VAR} in the scripts):
Advanced Bash Scripting Guide
Get the 2.50 MB Free eBook at:
http://tldp.org/LDP/abs/abs-guide.pdf
Current IP of the container
MYIP=`ifconfig venet0:0 | grep "inet" | cut -d":" -f 2 | cut -d " " -f 1`
Fully Qualified Domain Name of the container
FQDNAME=`hostname`.`dnsdomainname`
Generate Random Password
The following will generate a 12 character random password with special characters:
UPASSWD=`openssl rand -base64 12`
The following will generate a 12 character random password without special characters:
UPASSWD=`dd if=/dev/urandom count=200 bs=1 2>/dev/null|tr "\n" " "|sed 's/[^a-zA-Z0-9]//g'|cut -c-12`
Do not use reserved keywords like PASSWD, HOSTNAME, etc., as userland variables, since squeeze does not like bashisms and Debian is progressing to strict dash from lenient bash....
Generate an MD5 hash (lowercase) of a random number
SKEY3=`dd if=/dev/urandom count=2000 bs=1 2>/dev/null|tr "\n" " "|sed 's/[^0-9]//g'|cut -c-32`
UNIQAPPKEY=`echo -n ${SKEY3} | md5sum |cut -d ' ' -f 1`
MySQL Random root Password
echo Current \"root\" password for MySQL is stored in \"/root/.my.cnf\" file echo ...... and is \"`cat /root/.my.cnf | grep password | cut -d'"' -f 2`\"