I am using cygwin under windows server 2008 to have linux capability (to some degree) and ssh and be able to run apps without using a gui.
On another server that is ubuntu 18.04 I use containers to some how isolate my apps so that when I run an app and it spawns child processes and probabley modifies file descriptors etc (and so now I can not keep track of which processes are running now) I can stop my app and all the mess that it has done, with just stopping the container.
Containers made starting and stopping an app a clean and simple way.
Is there any way to have such thing on windows (without using docker on windows)? by saying this I mean the file and process isolation and not network or other stuff.
Is it possible to only isolate processes so that i can get rid of them with a single command?
Is there any tool for that? particularly for cygwin under windows?
I don't know about other languages but if you're using Python, it has a feature called Virtual Environment and developer can create and run applications in isolated environments. you can learn more about it here.
I myself come to the conclusion that using services and creating a service in windows would be the only way to manage an app without using a container.
When a Erlang system hangs I want to know what the system is doing during that time. For a c/c++ program, I can easily run the pstack, but I didn't find out a handy tool for this purpose in Erlang.
What is the pstack equivalent in Erlang?
Actually I want to check the running stack trace of the following process.
"/opt/couchbase/lib/erlang/erts-5.10.4.0.0.1/bin/beam.smp -P 327680 -K true -- -root /opt/couchbase/lib/erlang -progname erl --... "
and I started a new Erlang shell and start the webtool and check the appmon however I can't find the above application. What may cause this?
Thanks
Concerning pstack equivalent, have you read Erlang Profiling from official guide? It gives you lot of example on how to profile your application and find where your code stuck.
Another useful tools is observer it will show all working process, CPU usage, process stack and lot of more information.
If you don't see anything with these tools, you can try with Erlang debugger.
Now concerning couchbase, if your application is currently running, you can connect to it with Erlang shell and launch previous quoted commands and applications.
I don't know if you are using couchbase alone or with couchdb, but, if you want to use observer or other tools from command line, you can start couchdb with -i flag:
# -i use the interactive Erlang shell
couchdb -i
In case of your application run remotely without GUI, you can use etop, its a CLI alternative to observer. You can also dump etop output to file if you don't want to run it directly from your Erlang shell. IHMO, if you want more information concerning I/O or debug, use eprof, fprof and other profiling tools with dump file (see also eep profiling tool, easy to use).
Another alternative, if you are using SSH and want to see observer window, you can use X11Forwarding with ssh: ssh -X $yourserver or ssh -Y $yourserver and simply run observer:start(). in your Erlang shell.
When I modify a .yaws file it take a few (5, 10) seconds for changes to take effect, it it normal and Do I have to keep terminal open while I use YAWS server?
When you modify a .yaws file, Yaws recompiles it to an Erlang .beam file, which contains bytecode for the Erlang virtual machine, and reloads it. This won't be instantaneous of course, but it should not take 5-10 seconds; you should report a Yaws issue in that case, and please include a test case.
As for requiring a terminal, Yaws can run such that it gives you an interactive Erlang shell, or it can be run as a background daemon if you supply the --daemon command-line option. Yaws comes with a number of startup scripts for running it as a daemon on various operating systems.
I'm working on using erlang development server. Is there a way fro me to start the erlang vm and continue from the commandline or add a script to the startup files? To be clear I want to start erlang and keep it running outside of the command prompt.
You can use the -detached flag. See http://www.erlang.org/doc/man/erl.html for more information.
I usually use scripts, which rebar create-node do provide. There is such commands as: start, stop, ping and attach. Although you must use erlang releases in order to use this scripts (at list take a look at template, maybe it would be helpful)
I'm currently running Vista and I would like to manually complete the same operations as my Windows Service. Since the Windows Service is running under the Local System Account, I would like to emulate this same behavior. Basically, I would like to run CMD.EXE under the Local System Account.
I found information online which suggests lauching the CMD.exe using the DOS Task Scheduler AT command, but I received a Vista warning that "due to security enhancements, this task will run at the time excepted but not interactively." Here's a sample command:
AT 12:00 /interactive cmd.exe
Another solution suggested creating a secondary Windows Service via the Service Control (sc.exe) which merely launches CMD.exe.
C:\sc create RunCMDAsLSA binpath= "cmd" type=own type=interact
C:\sc start RunCMDAsLSA
In this case the service fails to start and results it the following error message:
FAILED 1053: The service did not respond to the start or control request in a timely fashion.
The third suggestion was to launch CMD.exe via a Scheduled Task. Though you may run scheduled tasks under various accounts, I don't believe the Local System Account is one of them.
I've tried using the Runas as well, but think I'm running into the same restriction as found when running a scheduled task.
Thus far, each of my attempts have ended in failure. Any suggestions?
Though I haven't personally tested, I have good reason to believe that the above stated AT COMMAND solution will work for XP, 2000 and Server 2003. Per my and Bryant's testing, we've identified that the same approach does not work with Vista or Windows Server 2008 -- most probably due to added security and the /interactive switch being deprecated.
However, I came across this article which demonstrates the use of PSTools from SysInternals (which was acquired by Microsoft in July, 2006.) I launched the command line via the following and suddenly I was running under the Local Admin Account like magic:
psexec -i -s cmd.exe
PSTools works well. It's a lightweight, well-documented set of tools which provides an appropriate solution to my problem.
Many thanks to those who offered help.
Download psexec.exe from Sysinternals.
Place it in your C:\ drive.
Logon as a standard or admin user and use the following command: cd \. This places you in the root directory of your drive, where psexec is located.
Use the following command: psexec -i -s cmd.exe where -i is for interactive and -s is for system account.
When the command completes, a cmd shell will be launched. Type whoami; it will say 'system"
Open taskmanager. Kill explorer.exe.
From an elevated command shell type start explorer.exe.
When explorer is launched notice the name "system" in start menu bar. Now you can delete some files in system32 directory which as admin you can't delete or as admin you would have to try hard to change permissions to delete those files.
Users who try to rename or deleate System files in any protected directory of windows should know that all windows files are protected by DACLS while renaming a file you have to change the owner and replace TrustedInstaller which owns the file and make any user like a user who belongs to administrator group as owner of file then try to rename it after changing the permission, it will work and while you are running windows explorer with kernel privilages you are somewhat limited in terms of Network access for security reasons and it is still a research topic for me to get access back
Found an answer here which seems to solve the problem by adding /k start to the binPath parameter. So that would give you:
sc create testsvc binpath= "cmd /K start" type= own type= interact
However, Ben said that didn't work for him and when I tried it on Windows Server 2008 it did create the cmd.exe process under local system, but it wasn't interactive (I couldn't see the window).
I don't think there is an easy way to do what you ask, but I'm wondering why you're doing it at all? Are you just trying to see what is happening when you run your service? Seems like you could just use logging to determine what is happening instead of having to run the exe as local system...
Using Secure Desktop to run cmd.exe as system
We can get kernel access through CMD in Windows XP/Vista/7/8.1 easily by attaching a debugger:
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\osk.exe" /v Debugger /t REG_SZ /d "C:\windows\system32\cmd.exe"
Run CMD as Administrator
Then use this command in Elevated:
CMD REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\osk.exe" /v Debugger /t REG_SZ /d "C:\windows\system32\cmd.exe"
Then run osk (onscreenkeyboard). It still does not run with system Integrity level if you check through process explorer, but if you can use OSK in service session, it will run as NT Authority\SYSTEM
so I had the idea you have to run it on Secure Desktop.
Start any file as Administrator. When UAC prompts appear, just press Win+U and start OSK and it will start CMD instead. Then in the elevated prompt, type whoami and you will get NT Authority\System. After that, you can start Explorer from the system command shell and use the System profile, but you are somewhat limited what you can do on the network through SYSTEM privileges for security reasons. I will add more explanation later as I discovered it a year ago.
A Brief Explanation of how this happens
Running Cmd.exe Under Local System Account Without Using PsExec. This method runs Debugger Trap technique that was discovered earlier, well this technique has its own benefits it can be used to trap some crafty/malicious worm or malware in the debugger and run some other exe instead to stop the spread or damage temporary. here this registry key traps onscreen keyboard in windows native debugger and runs cmd.exe instead but cmd will still run with Logged on users privileges, however if we run cmd in session0 we can get system shell. so we add here another idea we span the cmd on secure desktop remember secure desktop runs in session 0 under system account and we get system shell. So whenever you run anything as elevated, you have to answer the UAC prompt and UAC prompts on dark, non interactive desktop and once you see it you have to press Win+U and then select OSK you will get CMD.exe running under Local system privileges. There are even more ways to get local system access with CMD
an alternative to this is Process hacker if you go into run as... (Interactive doesnt work for people with the security enhancments but that wont matter) and when box opens put Service into
the box type and put SYSTEM into user box and put C:\Users\Windows\system32\cmd.exe leave the rest click ok and boch you have got a window with cmd on it and run as system now do the other steps for yourself because im suggesting you know them
There is another way. There is a program called PowerRun which allows for elevated cmd to be run. Even with TrustedInstaller rights. It allows for both console and GUI commands.
(Comment)
I can't comment yet, so posting here... I just tried the above OSK.EXE debug trick but regedit instantly closes when I save the filled "C:\windows\system32\cmd.exe" into the already created Debugger key so Microsoft is actively working to block native ways to do this. It is really weird because other things do not trigger this.
Using task scheduler does create a SYSTEM CMD but it is in the system environment and not displayed within a human user profile so this is also now defunct (though it is logical).
Currently on Microsoft Windows [Version 10.0.20201.1000]
So, at this point it has to be third party software that mediates this and further tricks are being more actively sealed by Microsoft these days.
if you can write a batch file that does not need to be interactive, try running that batch file as a service, to do what needs to be done.
I use the RunAsTi utility to run as TrustedInstaller (high privilege). The utility can be used even in recovery mode of Windows (the mode you enter by doing Shift+Restart), the psexec utility doesn't work there. But you need to add your C:\Windows and C:\Windows\System32 (not X:\Windows and X:\Windows\System32) paths to the PATH environment variable, otherwise RunAsTi won't work in recovery mode, it will just print: AdjustTokenPrivileges for SeImpersonateName: Not all privileges or groups referenced are assigned to the caller.
Using task scheduler, schedule a run of CMDKEY running under SYSTEM with the appropriate arguments of /add: /user: and /pass:
No need to install anything.
i used Paul Harris recommendation and created a batch file .cmd or .bat with what ever command i needed to run under system and used the schedule task run one time.
than trigger it as needed. and updated the batch as needed. so any command i need to run under system i just update the batch.