I want to run a command which will connect to a remote host and perform some actions, while I try to run the command below actions are required. also it asks for a password as below I have written a perl script as below: I needed a code which can answer the questions asked on console i.e. as below and
Automation of networks using ansible on openstack
I’ve written an ansible script, to create a network based on a condition. So that, even if I run ansible script again it will not create duplicate entries in my openstack environment. task: I don’t have either of the twonetworks in my project. My intention was, both the statments display null outp…
Bash completion sometimes meshes up my terminal when the completion function reads a file
So I’ve been having a problem with some cli programs. Sometimes when I kill the running process with Ctrl+C, it leaves the terminal in a weird state (e.g. echo is turned off). Now that is to be expected for many cases, as killing a process does not give it a chance to restore the terminal’s state.…
How to properly install Erlang, Elixir and mix on a server?
In order to deploy Elixir/Phoenix app I need to install Erlang, Elixir and mix on a server, correct? I haven’t found any straightforward way to do that, especially the laterst versions. How can I do it? In Ubuntu or CentOS. Answer Have you done any research?
Attach to a GNU screen and then execute commands
I have seen some similar questions asked but the solutions don’t seem to work in my case. I am trying to SSH into a specific screen instance on a Node machine and then execute some commands My current process is this: On the remote machine I create a screen instance: screen -dmS “my_screen” …
how to return a phys_addr_t type value to user space
I need my driver to return phys_addr_t type value through an ioctl call. I need to return this value through a struct which is passed through arg. The question is what type do I use in this struct? For example, say the following struct is passed through an arg virt_to_phys returns a phys_addr_t, however this …
Security concerns around KSM
When using KSM (Kernel Same-page Mapping), if two completely identical pages of memory are owned by two completely isolated processes, for example, two virtual machines, will those pages be merged? Or will they remain separate due to the fact that each process is isolated from each other? I’m confused b…
meaning of p in %pa[p] in the printk formats
The question is with regard to the printk formats. The documentation that I’m reading is located here Here is an excerpt that I’m asking about: What does [p] in %pa[p] stand for? What does it mean? Answer The p in [p] stands for phys_addr_t when used in %pap. This is analogous to the d in %pad sta…
javac error: “Cannot find symbol”
I’m trying to compile java files on an EC2 instance, and am having trouble. I have several JAR files as well that are included in the classpath. The example would be a StockTrade.java (which is a stock trade object), which compiles completely without issue. In the same directory, there is the StockTrade…
Linux dd create multiple iso files
I want to create an iso from an external hard drive. I used this command: sudo dd if=/dev/sdb of=usb-image.iso It works, however, the disk is large (700 GB), and i dont have space on my laptop to store that much. I was thinking about creating multiple iso files (each file 5 GB for example), this way, I can ma…