linux: the openVPN client connects to the VPN server from the Android application but not from the Ubuntu or iOS application

Disclaimer: I am publishing with full knowledge that the school owns the network and has every right to restrict traffic to your liking.

My rpi3 is running an openVPN server configured using PiVPN and is using TCP port 443. All configurations are predetermined in addition to the port and protocol. Using exactly the same ovpn files, 2 Android devices (100% success) successfully connected to the server in my school's network (which blocks the VPN), only one iPhone was tested and my laptop in Ubuntu failed (0% of success) with the notorious failed TCP handshake. The configuration file can not be guilty, since it works in one client but not in the others. In Android and iOS the same application is being used: OpenVPN Connect and in Ubuntu I was using the current version of repository 19.04 (the version that is being used at the time of this publication using apt-get install openvpn, I can not verify now). I tried to compile a previous version of OpenVPN (I think 2.3.9?) However, it was not generated due to an SSL error and I think I could not install the dependencies because some ubuntu repositories are also blocked in the school network.

My friend and I noticed that all the free VPN applications in the Play Store did not connect (even when moving to the less used apps), however, there were several VPNs in iOS that worked. So I decided to do this for my friend, and I tried it at home using data on an iPhone (it worked). So at school I let my friend try it and it worked, and we tested the Tor network and blocked websites like OneDrive (I think this was accidentally blocked by a general rule). Another friend tried it on his Android phone and it worked too. I thought everything was perfect, so one day I brought my laptop and used Ubuntu to test it, it would not connect (I do not have records or access to that computer or school now). I have searched for the error widely, and I have tried everything in vain. Another friend decided to test my VPN because I said there would be a speed benefit compared to free VPNs, and they tried it on their iPhone and it did not work. I did not have access to their records, but I can only assume that they could not do a TCP protocol either. My network is correctly configured with TCP port 443 forwarded to my pi, static IP, ddns, everything. I know it works because it works on Android all the time and on iOS when data is used. I tried using my Ubuntu laptop at home to connect to the pi while on the same network by changing the client's ovpn file to use the private IP, and it worked. This shows that the iOS application, the Ubuntu installation 19.04 and the Android applications are all able to connect when they are in unrestricted networks, but only the iOS application and the installation of Ubuntu do not work when they are in a restricted network.

Question: Why would there be a discrepancy between the clients used? Does anyone know the differences between how these applications behave?

Is it possible to recover a deleted file with the -r command on a linux server?

I made a very serious mistake. I was editing the crontab file of my remote server, I was as the root user and it turns out that I wrote "crontab -r" instead of "crontab -e" and without previous notice it was simply deleted. I was looking for information and it turns out that files deleted with the -r command are not stored somewhere like the recycle bin or something similar. I am very worried because there are scheduled backups and all the scripts that my hosting placed. I already communicate with them and I must wait for a response from a specialized person in a period of 24 to 48 hours, but I am very concerned. Has anyone had a similar experience? will it be possible to recover that file?

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linux – How do I correct the space allocation error on a machine with a lot of space?

I would like to run a model on RStudio Server, but I get this error.

Error: Unable to allocate a vector size of 57.8 Gb

This is how my data looks and has 10,000 rows.

            latitude longness close_dating close_price
1 1.501986 86.35068 2014-08-16 22: 25: 31.925431 1302246.3
2 36.367095 -98.66428 2014-08-05 06: 34: 00.165876 147504.5
3 36.599284 -97.92470 2014-08-12 23: 48: 00.887510 137400.6
4 67.994791 64.68859 2014-08-17 05: 27: 01.404296 -14112.0

This is my model.

library (caret)
training.samples <- data$close_price %>%
createDataPartition (p = 0.8, list = FALSE)
train.data <- data[training.samples, ]
test.data <- datatraining.samples,]model <- train (
close_price ~., data = train.data, method = "knn",
trControl = trainControl ("cv", number = 1),
preProcess = c ("center", "scale"),
tuneLength = 1
)

My instance of EC2 has more than 57 GB available. This is the memory.

                                                    total of free shared buffers used in cache
Mem: 65951628 830424 65121204 64 23908 215484
- / + buffers / cache: 591032 65360596
Swap: 0 0 0

And it has enough storage space, too. This is the hard drive space.

File system 1K-blocks used Available use% Assembled in
devtmpfs 32965196 64 32965132 1% / dev
tmpfs 32975812 0 32975812 0% / dev / shm
/ dev / xvda1 103079180 6135168 96843764 6% /

And these are details in the machine.

R version 3.5.3 (2019-03-11)
Platform: x86_64-pc-linux-gnu (64 bits)
Running under: Amazon Linux AMI 2018.03

linux: Excel format error in a binary file when created on a different server

The situation is: we have a raspberry pi and a TeamCity server. Raspberry Pi has Raspberry pi OS (based on Debian), the TeamCity server has Centos 7 (based on Rhel Fedora) and the program is written in GoLang.

When a binary is built in Raspbery pi, it only works on it or another Raspbery pi and if a binary is built on the teamcity server it only works on it.

So, I have come to the conclusion that it is a difference between the operating systems, but I have no idea how to solve it, since our binary could one day land on any Linux operating system.

Any idea how to make a binary executable in a Linux system in general, not just an operating system?

Capabilities – Difference between the capacities of linux and seccomp.

I know that seccomp (secure computing) is a way of restricting a process so that it does not make calls to a particular system.

While Linux capabilities provide a way to grant privileges to specific users or processes.

So, if I want to disable a process of making raw network connections. I can discard the NET_RAW linux capability from that process or use seccomp to restrict the process and make system calls relevant to the raw network.

I want to know the exact difference between the capabilities of Linux and seccomp.

It is also that Linux capabilities use seccomp internally or it is the other way around or both are completely different.

linux – Server failure in Ubuntu 18.04.2 LTS

I'm fairly new to Linux and I had a root server on hetzner.com, the problem is that sometimes it just shuts off randomly and it does not start anymore, I have to go to the panel of hetzners and simulate the pressure of the reset button. The problem is that some files are deleted when the server crashes and, since it does not restart automatically, the Minecraft server that I am running can not be executed either.

The most recent blockade occurred ~ 9:15 and this is the record of / var / log / syslog
https://pastebin.com/7mveyvKn

linux – I saw by default in zsh and bash are different

I have a root and a wheel user in CentOS 7. The default shell for the root and the wheel are bash and zsh respectively. The PATH is:

echo $ PATH
/ usr / local / sbin: / usr / local / bin: / usr / sbin: / usr / bin: / root / bin

/ usr / local / sbin is empty, and I defined in / usr / local / bin that vi -> / bin / vimx

This is what confuses me:
In the root, when I use vi, it starts automatically as vimx (as I hope)

which I saw
/ usr / local / bin / vi

However, in the user of the wheel, when I use vi, use vim,

which I saw
vi = vim

I checked all the directories in the PATH and the file ~ / .zshrc, but I do not see any such definition vi = vim anywhere. I am confused where this "vi = vim" could be defined.

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Step 4 – Download the Forge installer. a) create the cd / opt mkdir minecraft folder
cd minecraft.
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Note: this guide is intended only for advanced users. Command Center provides
An installer for the recommended versions of Minecraft Forge for all versions.
February 14, 2019 Follow this guide and learn how to make a Minecraft server. In the end, you can
Learn how to configure the MC server in Windows, MacOS and Linux.
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The Minecraft server runs after closing SSH / Putty. screen. run.sh.
Build a Modified Minecraft Server on Linux – linuxnorth.org
Tutorials / Setting up a Minecraft Forge server – Official Minecraft Wiki
Running a forging server in linux without a head – Optimal Prime
How to install Forge and Sponge (Minecraft) on a CentOS 6 server
How to install a Forge server – Knowledge Base – Akliz
How to make a Minecraft server – Step by step (Linux, Windows
Install MineCraft Forge & Mods in Linux Centos (command line
https://www.linuxnorth.org/minecraft/modded_linux.html
https://minecraft.gamepedia.com/Tutorials/Setting_up_a_Minecraft_Forge_server
https://blog.za3k.com/running-a-forge-server-on-headless-linux/
https://www.vultr.com/docs/how-to-install-forge-and-sponge-minecraft-on-a-centos-6-server
https://www.akliz.net/manage/knowledgebase/35/How-to-Install-a-Forge-Server.html
https://www.hostinger.com/tutorials/how-to-setup-minecraft-server
https://gist.github.com/unitycoder/8ef8a5b73f57e6504f160abd305c5093
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