I am using electron-vue & electron-packager. I am wondering whether I can do something like incremental updating, that is, after running an electron build command, I don’t need to copy the whole electron-linux-x64 folder to my dist machine to update it to the newest, but instead I only need to copy …
Tag: linux
Java web application seems to go idle quickly in Tomcat
I’m new to java and tomcat. I’m developing a website in java using spring mvc. It’s deployed to a linux server that’s running Tomcat 8. Everything works fine when I deploy, it connects to the database great. The issue is that the site seems to go idle very quickly. I haven’t been…
In the kernel space, how does one get the physical addresses corresponding to a file on ext4-formatted disk
If you’re here: https://github.com/torvalds/linux/blob/master/fs/ext4/file.c#L360 You have access to these two structs inside the ext4_file_mmap function: I am changing the implementation of this function for dax mode so that the page tables get entirely filled out for the file the moment you call mmap …
‘top’ shows Java program using more memory than Java profiler shows
What are the possible causes for when the Linux top command shows a Java process is using 14GBs of memory while Java profiling shows only 2GBs being used? Answer That means that your JVM / Java application is using off-heap memory. Lots of it. It could be memory-mapped files. It could be native libraries: unl…
Why doesn’t grep -lv work?
I want to print out the name of a file if and only if it does not contain the string foo. However, if file contains foo and I run this file is outputted. Why does this happen and what can I do to work around it? Answer -v means to match any line that doesn’t match the pattern. So -lv
Azure Powershell Module – Linux (.NET Core) Support
There exists an AzureRM module that is built on .NET Core. However, the AzureRM module doesn’t have all of the required functionality to interact with Azure. Many of the other cmdlets, such as New-AzureAffinityGroup, are present in the Azure module. Here are a list of other cmdlets: https://www.powershe…
Set docker image username at container creation time?
I have an OpenSuse 42.3 docker image that I’ve configured to run a code. The image has a single user(other than root) called “myuser” that I create during the initial Image generation via the Dockerfile. I have three script files that generate a container from the image based on what operati…
OpenSSL will not release file handles
I am writing a service (in C for CentOS) that must make lots of outbound SSL connections to a third party REST API via SSL. OpenSSL is used to create establishment of the secure connections with the remote server. After initialization of the ssl_connection I register the returned file descriptor with our epol…
PHP exec() not grabbing output from bash command
i’m trying to get the ouput from a bash command. If I execute the some command directly in the bash, i see the result. But not with PHP exec() function.. This command try to get a video resolution using ffmpeg lib. The video path it’s fine, I triple check that. Thanks! EDIT: screenshot from the ou…
Prevent entering duplicate records in file using Shell Script
I am creating one sh file in which user enters the roll number, name, subject name and marks. And i am storing it in one text file. Now i don’t want the user to enter the same roll number again. If he enters the same roll number it should throw an message. Here is what i have done: How to