I am trying to create an alert notification on ambari choosing alert script as method. Here are the steps I have followed:
Create an alert target using Create Alert Notification screen
{
"AlertTarget":
{
"name": "test_dispatcher",
"description": "Custom Notification Dispatcher",
"notification_type": "ALERT_SCRIPT",
"global": true,
"alert_states": ["CRITICAL","WARNING","UNKNOWN","OK"],
"properties": {
"ambari.dispatch-property.script": "notification.dispatch.alert.script",
"ambari.dispatch-property.script.filename" : "customdispatcher.py"
}
}
}
Create customdispatcher.py in /var/lib/ambari-server/resources/scripts/
## Writing notification to a file. Use your own logic here.
file = open("/var/log/ambari-server/custom_notification.log", "a+")
file.write("New notifiation")
file.close()
if __name__ == '__main__':
handle_alert()
Change file permissions.
chmod 777 /var/lib/ambari-server/resources/scripts/customdispatcher.py
chmod +x /var/lib/ambari-server/resources/scripts/customdispatcher.py
Add following line to ambari properties file
notification.dispatch.alert.script=/var/lib/ambari-server/resources/scripts/customdispatcher.py
Restart ambari
After these steps, I stop some services to trigger an alarm but get a warning in /var/log/ambari-server/ambari-server.log file and nothing is logged to custom_notification.log file.
2022-06-23 09:38:53,144 WARN [script-dispatcher-1] AlertScriptDispatcher$AlertScriptRunnable:363 - Unable to dispatch ALERT_SCRIPT notification because /var/lib/ambari-server/resources/scripts/customdispatcher.py terminated with exit code 2
Any ideas on how to fix this?
I've recorded a test using Selenium IDE and am submitting the generated .side file to selenium-side-runner to run on a Selenium Grid built using Zalenium. Is it possible to run a command that calls driver.manage().addCookie() from the test that was submitted to selenium-side-runner? I want to do this to send messages back to Zalenium with test progress and status
I added a command executeScript to the Selenium IDE editor with a target of driver.manage().addCookie({name: 'test', value: 'test'})
I see that the command that selenium-side-runner generated in commons.js was
await driver.executeScript(`driver.manage().addCookie({name:'test', value: 'test'});`);
Doing this causes the browser to report an error JavascriptError: javascript error: driver is not defined
I think what I need is the code to be generated without the driver.executeScript wrapper. Is there a way to accomplish this without exporting my Selenium IDE test to NUnit?
I was able to make this functionality work by crudely modifying the selenium-side-runner package on my Windows dev machine
In file ~\node_modules\selenium-side-runner\node_modules\selianize\dist\selianize.cjs.js
Change
function generateScript(script, isExpression = false) {
return `await driver.executeScript(\`${isExpression ? `return (${script.script})` : script.script}\`${script.argv.length ? ',' : ''}${script.argv.map(n => `vars["${n}"]`).join(',')});`;
}
to
function generateScript(script, isExpression = false) {
if (script.script.indexOf('zalenium') > -1)
{
return script.script;
} else
{
return `await driver.executeScript(\`${isExpression ? `return (${script.script})` : script.script}\`${script.argv.length ? ',' : ''}${script.argv.map(n => `vars["${n}"]`).join(',')});`;
}
}
Now when running a test with selenium-side-runner, calling "executeScript" with any value that contains zalenium will generate the command verbatim in the test script
So I've got this scenario where I have separate Web server and MySQL server, and I can only connect to the MySQL server from the web server.
So basically everytime I have to go like:
step 1: 'ssh -i ~/somecert.pem ubuntu#1.2.3.4'
step 2: 'mysqldump -u root -p'password' -h 6.7.8.9 database_name > output.sql'
I'm new to gulp and my aim was to create a task that could automate all this, so running one gulp task would automatically deliver me the SQL file.
This would make the developer life a lot easier since it would just take a command to download the latest db dump.
This is where I got so far (gulpfile.js):
////////////////////////////////////////////////////////////////////
// Run: 'gulp download-db' to get latest SQL dump from production //
// File will be put under the 'dumps' folder //
////////////////////////////////////////////////////////////////////
// Load stuff
'use strict'
var gulp = require('gulp')
var GulpSSH = require('gulp-ssh')
var fs = require('fs');
// Function to get home path
function getUserHome() {
return process.env.HOME || process.env.USERPROFILE;
}
var homepath = getUserHome();
///////////////////////////////////////
// SETTINGS (change if needed) //
///////////////////////////////////////
var config = {
// SSH connection
host: '1.2.3.4',
port: 22,
username: 'ubuntu',
//password: '1337p4ssw0rd', // Uncomment if needed
privateKey: fs.readFileSync( homepath + '/certs/somecert.pem'), // Uncomment if needed
// MySQL connection
db_host: 'localhost',
db_name: 'clients_db',
db_username: 'root',
db_password: 'dbp4ssw0rd',
}
////////////////////////////////////////////////
// Core script, don't need to touch from here //
////////////////////////////////////////////////
// Set up SSH connector
var gulpSSH = new GulpSSH({
ignoreErrors: true,
sshConfig: config
})
// Run the mysqldump
gulp.task('download-db', function(){
return gulpSSH
// runs the mysql dump
.exec(['mysqldump -u '+config.db_username+' -p\''+config.db_password+'\' -h '+config.db_host+' '+config.db_name+''], {filePath: 'dump.sql'})
// pipes output into local folder
.pipe(gulp.dest('dumps'))
})
// Run search/replace "optional"
SSH into the web server runs fine, but I have an issue when trying to get the mysqldump, I'm getting this message:
events.js:85
throw er; // Unhandled 'error' event
^
Error: Warning:
If I try the same mysqldump command manually from the server SSH, I get:
Warning: mysqldump: unknown variable 'loose-local-infile=1'
Followed by the correct mylsql dump info.
So I think this warning message is messing up my script, I would like to ignore warnings in cases like this, but don't know how to do it or if it's possible.
Also I read that using the password directly in the command line is not really good practice.
Ideally, I would like to have all the config vars loaded from another file, but this is my first gulp task and not really familiar with how I would do that.
Can someone with experience in Gulp orient me towards a good way of getting this thing done? Or do you think I shouldn't be using Gulp for this at all?
Thanks!
As I suspected, that warning message was preventing the gulp task from finalizing, I got rid of it by commenting the: loose-local-infile=1 From /etc/mysql/my.cnf
I am testing with Selenium-rc 1.0.3 and I am getting a Permission denied error message in IE when I run my IDE script from the command line.
I am trying to run an IDE script in Internet explorer using the selenium control RC 1.0.3
from the command line:
java -jar selenium-server.jar -htmlsuite "*iexploreproxy" "url
address/where" "C:\Users\sat\Documents\selenium\suite.html"
"C:\Users\sat\Documents\selenium scripts\results.htm" at this point
The IE window pops up saying as below
I get a security warning saying "Do you want to view only the webpage content that was delivered securely?" I hit Yes and I see this error in the test runner window:
Webpage error details
Message: Access is denied.
Line: 177
Char: 9
Code: 0
URI: xx.xx.xx.xxx/selenium-server/core/scripts/selenium-testrunner.js
UPDATE:
I looked at the line 177 and char :9 in the script and it points to
var runInterval = 0;
/** SeleniumFrame encapsulates an iframe element */
var SeleniumFrame = classCreate();
objectExtend(SeleniumFrame.prototype, {
initialize : function(frame) {
this.frame = frame;
addLoadListener(this.frame, fnBind(this._handleLoad, this));
},
getWindow : function() {
return this.frame.contentWindow;
},
getDocument : function() {
return this.frame.contentWindow.document; - line 177 char 9
},
_handleLoad: function() {
this._attachStylesheet();
this._onLoad();
if (this.loadCallback) {
this.loadCallback();
}
Do you know what the error is about? Why do I get that? I see my test cases and everything in the test runner window, but I can't run them in the IE browser. I searched the web with no avail.
I do not have much experience with running the test from CLI, but have you tried starting Selenium RC with administrator permission?
Any particular reason for not using the new Selenium 2 IWebDriver and a test framework?
The error might be caused by the use of iframe/frameset and IE's security settings. Default settings are that, if a site uses iframe/frameset and the frame content originates from 2 different root domains, then this is a security risk. Try is add the sites to your list thrusted site for IE. Have you tried to ude the firefox driver instead (will not have this security restriction).
Screen is amazing, of course, but I don't want to have to think about it. I often ssh to a machine, start doing a bunch of stuff, and then think "gosh, I wish I had thought to start a screen session before doing all that so I could reconnect to this from home later".
I'd like to have screen automatically started whenever I log in to a machine.
And when I get disconnected, I want to be able to immediately and simply reconnect without fussing with "screen -ls" and "screen -dr".
I have a script that implements one solution to this problem which I'll post as an answer. I'm interested to see other approaches.
Use the following, ssc, instead of ssh. If you just do "ssc remote.com" then it will list existing screen sessions. Give it a 3rd argument and it will connect to that screen session, or create it and connect to it. Either way, if you get disconnected you can just do "up-arrow, enter" in the shell to reconnect. Zero knowledge of screen required!
Edit: Thanks to #klochner for extending this to handle arbitrary ssh options. You can now use this just like ssh!
#!/usr/bin/env perl
# Use 'ssc' (this script) instead of 'ssh' to log into a remote machine.
# Without an argument after the hostname it will list available screens.
# Add an argument after the hostname to attach to an existing screen, or
# specify a new screen. Eg, ssc remote.com foo
# The numbers in front of the screen tag can usually be ignored.
# ssh option parsing by #klochner
my $optstring = "";
while ($val = shift) {
if ($val =~ /^-\w$/) { $optstring .= " ".$val.(shift); }
elsif ($val =~ /^-\w+$/) { $optstring .= " ".$val; }
elsif ($machine) { $tag = $val; }
else { $machine = $val; }
}
if (!$machine) {
print "USAGE: ssc [ssh options] remote.com [screen name]\n";
} elsif (!$tag) {
#screens = split("\n", `ssh $optstring $machine screen -ls`);
for(#screens) {
if(/^\s*(\d+)\.(\S+)\s+\(([^\)]*)\)/) {
($num, $tag, $status) = ($1, $2, $3);
if($status =~ /attached/i) { $att{"$num.$tag"} = 1; }
elsif($status =~ /detached/i) { $att{"$num.$tag"} = 0; }
else { print "Couldn't parse this: $_\n"; }
# remember anything weird about the screen, like shared screens
if($status =~ /^(attached|detached)$/i) {
$special{"$num.$tag"} = "";
} else {
$special{"$num.$tag"} = "[$status]";
}
}
}
print "ATTACHED:\n";
for(sort { ($a=~/\.(\w+)/)[0] cmp ($b=~/\.(\w+)/)[0] } keys(%att)) {
($tag) = /\.(\w+)/;
print " $tag\t($_)\t$special{$_}\n" if $att{$_};
}
print "DETACHED:\n";
for(sort { ($a=~/\.(\w+)/)[0] cmp ($b=~/\.(\w+)/)[0] } keys(%att)) {
($tag) = /\.(\w+)/;
print " $tag\t($_)\t$special{$_}\n" unless $att{$_};
}
} else {
system("ssh $optstring -t $machine \"screen -S $tag -dr || screen -S $tag\"");
}
Btw, there's a trick to forcing an ssh session to exit and give you back your local terminal prompt when you lose network connectivity:
https://superuser.com/questions/147873/ssh-sessions-in-xterms-freeze-for-many-minutes-whenever-they-disconnect
there is autossh which automatically reconnects disconnected ssh-sessions.
It comes with an example script called rscreen which does exactly that. It is, simply:
#!/bin/sh
autossh -M 0 -t $1 "screen -e^Aa -D -R"
Then you have to retrain your fingers to type rscreen hostname instead of ssh hostname
ssh user#host.com -t 'screen -dRR'
This will reload/create your screen session on connect. This does exactly what was requested, even if it moves the responsibility for spawning the session to the initiating client. Ideally you would want some process on the server managing what gets presented to connecting clients. As far as I know that doesn't exist. No one has suggested the ideal solution in this thread. For me this is less "not ideal" than the rest. No scripts, no bugs, no TTY issues, no bad interactions with other ssh commands, no potential for infinite loops, no file editing, no additional packages required.
Actually screen sets the TERM variable to 'screen'. So the script is even easier. Here is what I use:
if [ "$TERM" != "screen" ]; then
screen -xRR
fi
Works like a charm, the -x ensures that even if the screen is attached somewhere else I attach to it here. This way I only every have one screen where I can keep track of everything.
I have the following in my .bashrc
if [ "$PS1" != "" -a "${_STARTED_SCREEN:-x}" = x -a "${SSH_TTY:-x}" ]
then
export _STARTED_SCREEN=1;
sleep 1
screen -RR && exit 0
# normally, execution of this rc script ends here...
echo "Screen failed! continuing with normal bash startup"
fi
I found it online somewhere awhile ago, not sure where.
Update Fixed error that was pointed out in comments. Thanks R. Pate
i have used autossh, it is very useful to me
Maybe put exec screen -dr in your .login?
I use mosh (mobile shell). It keeps your connection on even if you go to sleep mode, disconnect from the network, change IP, and so on. Whenever you return, you get your connection back.
I often connect to a remote machine from multiple terminal tabs. This in my zshrc checks if there's any detached session, and if there's one, connects to it. Else, it'll create a new screen. This allows me to resume work easily after an facing a network interruption easily even if I had 3 ssh sessions open. I just have to reopen 3 ssh tabs or reconnect on the previous 3 tabs and they'll resume as if nothing happened.
First if checks if already inside another screen or tmux window and to make sure that the shell is in interactive mode.
if command -v tmux &> /dev/null && [ -n "$PS1" ] && [[ ! "$TERM" =~ screen ]] && [[ ! "$TERM" =~ tmux ]] && [ -z "$TMUX" ] && [[ ! "$TERM" =~ screen.xterm-256color ]]; then
SCLS=$(screen -ls | grep Detached)
if [ ${#SCLS} -gt 0 ]
then
echo -n $SCLS | wc -l
SID=$( echo $SCLS | head -n1 | cut -d. -f1 | awk '{print $1}' )
screen -r $SID
else
screen zsh -c "echo -e Spawned new screen '\n' && screen -ls && echo && zsh"
fi
fi
suggestions for improving are welcome.
Depends on your shell, but what about .bashrc? (If you use bash "screen -rd")