Categories
Cryptocurrency Ethereum Mastering Development

What is the API Key to input for Etherscan Contract Verification in Remix IDE?

I would like to ask, where can I obtain the said API Key for Etherscan Contract Verification in Remix IDE? I did provide the API Key as highlighted in Yellow Color but is Invalid API Key. What type of API Key in Remix IDE need? Any ideas?

Categories
Mastering Development System & Network

Vpn gateway for multisite to multisite tunneling

Initially I have a simplest server to clients side VPn tunneling as below. I used simple Openvpn server and Client side architechture. Now the situation is there are multiple server side and their corresponding client sides, but in between i have a host domain (a host domain to monitor devices and routing). for Server 1 […]

Categories
Mastering Development System & Network

Metal-as-a-Service in an existing environment

We’re looking at MaaS for our bare metal server environment to replace old school kickstart scripts. MaaS works great if you want to go with the full “reimage everything” train. However, we have many machines where we don’t have the time (or it’s extremely disruptive) to re-image… in order to “cut over” to MaaS. In […]

Categories
Database Development

Best Way to optimize MariaDB For WordPress

I have a wordpress site with traffic 2k+ concurrently and the high peak is 4k with Mariadb database running on Ubuntu 18.04 dedicated server: Web server: Server version: Nginx PHP: PHP Version 7.4 Procesor: Intel 2x Xeon E5-2630v3 – 16/32t – 2.4GHz /3.2GHz RAM: 128GB DDR4 ECC 1866 MHz Disks: SoftRaid 2x450GB SSD can anyone […]

Categories
Database Development

How to use WHERE condition when using ON clause

I have looked at similar posts and have tried them but dint seem to work. In the below query on a MSSQL 2015 database, I need to filter out inactive users. That is, only return results where ‘Active’ = ‘1’. I tried: ON Users.[Name] = Skills.[Name] where Users.[Active] = 1 —- Incorrect syntax near the […]

Categories
Linux Mastering Development

word count redirect [closed]

I can’t seem to answer this question: Use the command “wc” to count the number of words in the file “/course/linuxgym/gutenberg/0ws0310.txt”. Store the exact output of the wc command when used with the “word counts” option into the file “count.txt”. Ensure that the filename within the file contains the full pathname.

Categories
Linux Mastering Development

Destination folder in rsync disappears

When I run this command: rsync rsync -avP /folder/with/files /destination/folder I can see the destination folder but after a while, and while the rsync command is still running, I cannot find it. Any ideas why this might happen and what I am doing wrong?

Categories
Linux Mastering Development

Restore previous version of file on iOS [3rd party app // Microsoft Edge] [closed]

I have a Microsoft Edge browser installed and i always use it inPrivate mode, sometimes it crash but my tabs always were still saved there, but one day the app crashed and all my tabs gone and i had like 20 of them with important info. As far as i understand this app stores tabs […]

Categories
Linux Mastering Development

Errors on startup

I have installed 3 days ago Debian 10.3.0 with LXQT. It’s great and I like it, it boot fine, each kernel line on boot is so great to see when appears 2 red lines that are so ugly! [OK] Started /etc/rc.local. [26.409377] CIFS: Unknown mount option “umask=000” [FAILED] Failed to mount /mnt/smb. See ‘systemctl status […]

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Linux Mastering Development

Access NATed remote system through an existing ssh connection

There is a machine RemoteA that is behind a NAT somewhere on the internet. It can connect to an ssh server. There is another machine called RemoteB that also has a connection to the same ssh server. If RemoteA connects to the SSH Server via an ssh connection, and RemoteB is also connected to an […]