Is there a way to check if an image created by glance below exists in Openstack by its name "myimage" using shell script?
glance image-create --name "myimage" --disk-format qcow2 --container-format bare --is-public True --progress < myimage.qcow2
You can use this command in shell script to check whether "myimage" already exist in glnace.
glance image-list | grep myimage
It will return matched image names if image exists, otherwise you will get zero results.
Edit
#!/bin/sh
image="myimage"
if glance image-list | grep $image > /dev/null
then
echo "$image already exists"
else
echo "$image does not exist"
fi
Related
NordVPN does not offer an automatic setup for linux, just VPN config files. What's the best way to implement this?
(my own implementation below, please feel free to comment or suggest improvements!)
EDIT: When I wrote this, I did not know that NordVPN did introduce a command line tool for linux recently.
I have written a little script that downloads the config files, renames them and enables automatic authentification. Insert your NordVPN login credentials in the generate authentification file part.
#!/bin/bash
# run as root!!!
# install openvpn. I'm running arch, this might be different on your system.
pacman -S openvpn
# go to openvpn config folder
cd /etc/openvpn
# download config files, extract and clean up
wget https://downloads.nordcdn.com/configs/archives/servers/ovpn.zip
unzip ovpn.zip
rm ovpn.zip
# rename tcp config files and put them in /etc/openvpn/client
cd ovpn_tcp
for file in *; do mv "${file}" "${file/.nordvpn.com.tcp.ovpn/}tcp.conf"; done
cp * ../client
# rename udp config files and put them in /etc/openvpn/client
cd ../ovpn_udp
for file in *; do mv "${file}" "${file/.nordvpn.com.udp.ovpn/}udp.conf"; done
cp * ../client
# generate authentification file
cd ../client
printf "<your email>\n<your password>" > auth.txt
# make all configs use authentification file
find . -name '*.conf' -exec sed -i -e 's/auth-user-pass/auth-user-pass\ auth.txt/g' {} \;
# clean up
cd ..
rm -r ovpn_tcp/
rm -r ovpn_udp
You can now start and stop vpn-connections via e.g.
systemctl start openvpn-client#de415tcp.service
and
systemctl stop openvpn-client#de415tcp.service
To automate this, and to connect to the server recommended by NordVPN, I have written two scripts. Make them executable and put them somewhere in your $PATH.
Pass a country code (like us, de or uk) as command line argument to start-vpn if you want to choose a specific country. It automatically chooses a tcp connection. You can change that to udp if you want.
start-vpn
#!/usr/bin/python
import sys
import requests
import os
import time
# you don't necessarily need the following. It's for monitoring via i3blocks.
def notify_i3blocks():
os.system('pkill -RTMIN+12 i3blocks')
def fork_and_continue_notifying_in_background():
newpid = os.fork()
if newpid == 0: # if this is the child process
for i in range(60):
notify_i3blocks()
time.sleep(1)
if __name__ == '__main__':
notify_i3blocks()
# below is what you do need.
suffix = ''
if len(sys.argv) > 1:
countries = requests.get('https://nordvpn.com/wp-admin/admin-ajax.php?action=servers_countries').json()
for country in countries:
if country["code"].lower() == sys.argv[1].lower():
suffix = '&filters={"country_id":' + str(country["id"]) + '}'
result = requests.get('https://nordvpn.com/wp-admin/admin-ajax.php?action=servers_recommendations' + suffix)
profile = result.json()[0]['subdomain'] + 'tcp'
command = 'systemctl start openvpn-client#' + profile + '.service'
os.system(command)
# the following is for i3blocks again.
fork_and_continue_notifying_in_background()
stop-vpn
#!/bin/bash
function service {
systemctl |
grep openvpn |
grep running |
head -n1 |
awk '{print $1;}'
}
while [[ $(service) ]]; do
systemctl stop $(service)
done
# notify i3blocks
pkill -RTMIN+12 i3blocks
For convenience, I have two aliases in my ~/.bashrc:
alias start-vpn='sudo start-vpn'
alias stop-vpn='sudo stop-vpn'
if you do want to monitor it via i3blocks, put this in your i3blocks config:
[vpn]
interval=once
signal=12
and this in your i3blocks-scripts-directory (with name vpn):
#!/bin/bash
function name {
systemctl |
grep openvpn |
grep running |
head -n1 |
awk '{print $1;}' |
cut -d # -f 2 |
cut -d . -f 1
}
starting=$(pgrep -f start-vpn) # this might not be the most accurate, but it works for me. Improvement suggestions are welcomed.
if [[ $(name) ]]; then
echo $(name)
echo && echo "#00FF00"
else
if [[ ${starting} ]]; then
echo starting vpn...
echo && echo "#FFFF00"
else
echo no vpn
echo && echo "#FF0000"
fi
fi
In order to automatically start and stop vpn when a network interface goes up/down, put the following in /etc/NetworkManager/dispatcher.d/10-openvpn. To activate the feature you need to enable and start the NetworkManager-dispatcher.service. More info here.
At my university, I connect to eduroam, which does not allow vpn. That's why I exclude that.
/etc/NetworkManager/dispatcher.d/10-openvpn
#!/bin/bash
case "$2" in
up)
if ! nmcli -t connection | grep eduroam | grep wlp3s0 ; then
start-vpn
fi
;;
down)
stop-vpn
;;
esac
I hope this helps other people who want to use NordVPN on linux. Again, feel free to comment and suggest improvements.
In particular, I am not sure how much of a security risk it is to have the NordVPN-password written out in plain text in a file.
In my Dockerfile I'm trying to download the latest WordPress version without any content inside it, but I'm having trouble automating the latest version number so that I don't have to manually change it when the new version of WordPress comes out.
In my Dockerfile I have
ARG LATESTWPVER="$(curl -s https://api.wordpress.org/core/version-check/1.5/ | head -n 4 | tail -n 1)"
ADD $(https://downloads.wordpress.org/release/wordpress-$LATESTWPVER-no-content.zip) /var/www/latest.zip
But the problem is that my LATESTWPVER is not 4.9.8, and I get the error
ADD failed: stat /var/lib/docker/tmp/docker-builder962069305/$(https:/downloads.wordpress.org/release/wordpress-$(curl -s https:/api.wordpress.org/core/version-check/1.5/ | head -n 4 | tail -n 1)-no-content.zip): no such file or directory
It passes the entire command and I'd like to have the output of that command.
In my shell file the
#!/bin/bash
WP_LATEST="$(curl -s https://api.wordpress.org/core/version-check/1.5/ | head -n 4 | tail -n 1)"
echo $WP_LATEST
will return the number 4.9.8.
From the error, I'm guessing that you can only assign something to the variable, but not execute it. Is there a way to execute a command and assign it to a variable and pass it as an argument?
A Dockerfile is not a shell or a build script, so it will not execute what you pass in ARG. There is a workaround - define the version as an ARG and pass that during build.
Dockerfile:
--
FROM ubuntu:latest
ARG LATESTWPVER
RUN echo $LATESTWPVER
ADD https://downloads.wordpress.org/release/wordpress-$LATESTWPVER-no-content.zip /var/www/latest.zip
docker build --build-arg LATESTWPVER=`curl -s https://api.wordpress.org/core/version-check/1.5/ | head -n 4 | tail -n 1` .
Sending build context to Docker daemon 6.656kB
Step 1/4 : FROM ubuntu:latest
---> 113a43faa138
Step 2/4 : ARG LATESTWPVER
---> Using cache
---> 64f47dcfe7fa
Step 3/4 : RUN echo $LATESTWPVER
---> Running in eb5fdd005d77
4.9.8
Removing intermediate container eb5fdd005d77
---> 1015629b927e
Step 4/4 : ADD https://downloads.wordpress.org/release/wordpress-$LATESTWPVER-no-content.zip /var/www/latest.zip
Downloading [==================================================>] 7.118MB/7.118MB
---> 72f0d3790e51
Successfully built 72f0d3790e51
For the https://github.com/ellakcy/piwik-with-wordpress I am making a restore bash script in order to restore the backup generated from the https://github.com/ellakcy/piwik-with-wordpress/blob/master/scripts/pre-backup script
The main idea is to set a path with a tarball containing the backup and recreating the folders that volumes are mounted.
The script is the following:
#!/bin/bash
# Printing functions
black='\E[30;40m'
red='\E[31;40m'
green='\E[32;40m'
yellow='\E[33;40m'
blue='\E[34;40m'
magenta='\E[35;40m'
cyan='\E[36;40m'
white='\E[37;40m'
#Echo a string with color
cecho () # Color-echo.
# Argument $1 = message
# Argument $2 = color
{
local default_msg="No message passed."
# Doesn't really need to be a local variable.
message=${1:-$default_msg} # Defaults to default message.
color=${2:-$black} # Defaults to black, if not specified.
echo -e "$color"
echo "$message"
tput sgr0 # Reset to normal.
return
}
#Echo a string as error with color
cecho_err () # Color-echo.
# Argument $1 = message
# Argument $2 = color
{
local default_msg="No message passed."
# Doesn't really need to be a local variable.
message=${1:-$default_msg} # Defaults to default message.
color=${2:-$red} # Defaults to black, if not specified.
echo >&2 -e "$color"
echo >&2 "$message"
tput sgr0 # Reset to normal.
return
}
backup_file=${1}
cecho "Creating the correct folders" $cyan
cecho "Deleting data folder in order to recreate it" $red
sudo rm -rf ./data
mkdir ./data/
sudo chown root:root ./data/
sudo chmod 755 ./data/
if [ ! -f restore ]; then
mkdir ./restore/
fi
tar -xf ${backup_file} -C ./restore/
cecho "Restoring backup data for wordpress" $cyan
sudo mkdir ./data/wordpress
sudo chown root:root ./data/wordpress
sudo chmod 755 ./data/wordpress
sudo mv ./restore/wordpress/data/www ./data/wordpress/
sudo chown www-data:www-data ./data/wordpress/www
cecho "Restoring environment" $cyan
wordpress_env=$(tr '\n' ' ' <./restore/wordpress/env.txt)
echo ${wordpress_env}
cecho "Restoring database" $cyan
sudo mkdir ./data/wordpress/db
echo "sudo env ${wordpress_env} docker run --volume \"./data/wordpress/db\":/var/lib/mysql --volume ./restore/wordpress/db:/docker-entrypoint-initdb.d -e MYSQL_ROOT_PASSWORD=\$WORDPRESS_MYSQL_ROOT_PASSWORD -e MYSQL_DATABASE=\"wordpress\" -e MYSQL_USER=\$WORDPRESS_MYSQL_USER -e MYSQL_PASSWORD=\$WORDPRESS_MYSQL_PASSWORD mariadb" > ./restore_db.sh
chmod +x ./restore_db.sh
./restore_db.sh
# rm -rf ./restore_db.sh
rm -rf ./restore
And I get this error when I try to restore the database:
docker: Error response from daemon: create ./data/wordpress/db: "./data/wordpress/db" includes invalid characters for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed.
See 'docker run --help'.
As you can see it generates a temporary scripts (that later will be deleted) one example of generated script is:
sudo env WORDPRESS_MYSQL_ROOT_PASSWORD=passwd WORDPRESS_MYSQL_USER=wordpress WORDPRESS_MYSQL_PASSWORD=wordpress WORDPRESS_ADMIN_USER=admin WORDPRESS_ADMIN_PASSWORD=admin WORDPRESS_URL=http://0.0.0.0:8080 docker run --volume "./data/wordpress/db":/var/lib/mysql --volume ./restore/wordpress/db:/docker-entrypoint-initdb.d -e MYSQL_ROOT_PASSWORD=$WORDPRESS_MYSQL_ROOT_PASSWORD -e MYSQL_DATABASE="wordpress" -e MYSQL_USER=$WORDPRESS_MYSQL_USER -e MYSQL_PASSWORD=$WORDPRESS_MYSQL_PASSWORD mariadb
What is the best option in order to generate the correct volume data in ./data/wordpress/db that mounts on a container's /var/lib/mysql?
When we specify --volume <host_dir>:<container_dir>, host_dir must be an absolute path. If it is not an absolute path, then it considered to be the volume's name. Hence the message invalid characters for a local volume name. Try providing absolute path for the host directory.
I run this command to get specific nova instance.here in my case "MyProxy-VM"
nova list --name MyProxy-VM --fields id |grep MyProxy-VM |cut -f 2 -d "|"
It works fine and also bit faster
I want to list specific glance image say "Ubuntu-14.04"
glance image-list | grep Ubuntu-14.04 | awk '{print $2;}
This command takes time so i want to list specific image.
I didn't find any option for this in openstack docs.
Is there any way to do this.
You can get the same results without grep, cut, awk calls. You can use openstack command with additional command line parameters. For example:
# openstack server list --name dev -f value -c ID
# openstack image list --property name=centos7 -f value -c ID
I am just curious is there any way to determine if a particular module is loaded/installed.
$ lsmod lists all modules (device driver loaded).
Is there any way to check or a command that returns true/false boolean output if a module name is polled. For eg. if keyboard.o exists return true else false. I need this tip to complete my driver auto refresh program.
PS: tried modinfo. I am using busybox client in my test DUT so can you give some alternatives other than modinfo?
The modinfo module method does not work well for me. I prefer this method that is similar to the alternative method proposed:
#!/bin/sh
MODULE="$1"
if lsmod | grep -wq "$MODULE"; then
echo "$MODULE is loaded!"
exit 0
else
echo "$MODULE is not loaded!"
exit 1
fi
not sure if modinfo modname and checking $? will work for you, just a suggestion.
/tmp$ sudo modinfo e1000
/tmp$ echo $?
0
/tmp$ sudo modinfo keyboard
ERROR: modinfo: could not find module keyboard
/tmp$ echo $?
1
alternatively you also grep /proc/modules
The --first-time flag causes modprobe to fail if the module is already loaded. That in conjunction with the --dry-run (or the shorthand -n) flag makes a nice test:
modprobe -n --first-time $MODULE && echo "Not loaded" || echo "Loaded"
Edit 1: As #Nobody pointed out this also prints Loaded if the module does not exist. We can fix this by combining it with modinfo:
modinfo $MODULE >/dev/null 2>/dev/null &&
! modprobe -n --first-time $MODULE 2>/dev/null &&
echo "Loaded" || echo "Not loaded"
Edit 2: On some systems modprobe lives in /usr/sbin, which is not in the $PATH unless you are root. In that case you have to substitute modprobe for /usr/sbin/modprobe in the above.
I wrote this:
MODULE=snd_aloop # for example
test -n "$(grep -e "^$MODULE " /proc/modules)" && echo "Loaded" || echo "Not loaded"
It checks in /proc/modules. If the module is mentioned there, it's assumed to be loaded, otherwise not.
The others seemed too long to me (the other short one requires root, this does not). Of course it's just written out what was already mentioned as "alternatives".
Caution: modprobe accepts some variants of module names other than the primary listed in /proc/modules. For example loading snd-aloop works, but the module is named snd_aloop and is listed as such in /proc/modules and when using rmmod that's also the only name that will work.
My short way to find if a given module is actually loaded:
cat /proc/modules | grep -c nfnetlink
which outputs
2
That 2 (TWO) means the module is LOADED. The actual output without -c shows all loaded modules with MODULENAME - -c counts the lines that contain MODULENAME. So if you have 0 (ZERO) lines as output then the module is not loaded
The better idea is to create a bash function:
#!/bin/sh
function moduleExist(){
MODULE="$1"
if lsmod | grep "$MODULE" &> /dev/null ; then
return 0
else
return 1
fi
}
if moduleExist "module name"; then
#do somthing
fi
!/bin/sh
# Module
MODULE="scsi_dh_rdac"
#Variables check if module loaded or not
MODEXIST=/sbin/lsmod | grep "$MODULE"
if [ -z "$MODEXIST" ]; then
/sbin/modprobe "$MODULE" >/dev/null 2>&1
fi
module list
Returns:
Currently Loaded Modulefiles:
1) /coverm/0.3.0 2) /parallel/20180222
grep -wEq "^${module%.o}" /proc/modules
returns true (e.g. can be used in an if) whether you ask for keyboard or keyboard.o
grep -q $pattern against lsmod or /proc/modules, which are available on most systems and a standard "source of truth"
lsmod | grep -q $pattern
$ lsmod | grep -q msr
$ echo $?
0
$ lsmod | grep -q duediligencemuch
$ echo $?
1