Number of installs is not determined by WordPress, it is determined purely by hosting resources and policies. From personal experience even one blog with 1k daily visits can border overusing CPU quotas on crappy shared hosting with overstuffed server. If you want to force this through – request specific resource usage policies and hard numbers … Read more
Have a look at this excellent question and answers on Server Fault that discusses how to secure your LAMP stack. Make sure your FTP user can only access the directories you want. Setup sudo to allow a non root user to run commands as root. Lock down your ssh so that root cannot log in … Read more
First and most important question – did your host meant that you server is actively sending spam or is being used to relay spam? If former then you need to trace that down and cleanup (which takes someone competent looking at it, if you are not confident to do it yourself). After that my first … Read more
If I use Apache & ngnix together will I have fewer problems? Yes, of course. Please be sure to install and setup mod_rpaf in Apache, if you are going to setup Nginx as reverse proxy to Apache. I was wondering if I used Apache and Nginx together, with nginx serving static files, apache php would … Read more
512MB should be fine, especially if you just started building your site. I’ve ran single WP installs on DigitalOcean droplets with 512MB of RAM without any issues in the past, also on NginX. Obviously, server stability also greatly depends on how NginX, MySQL etc have been configured (ie. not to consume too much memory and … Read more
Is Dedicate, VPS or shared server effect in SEO? No, it doesn’t matter. What do you think how many website I can host in a single IP or I need to use different IP for different website? As much as you want, quantity doesn’t matter. Many hosting providers keep thousands of sites on one server.
Backups: Sounds like you need two types. 1. Versioning (eg use Git or SVN) and 2. Failsafe backup – some good plugins for this, or use a cron job to backup the WP files and database Sounds like there’s two needs here as well. 1. An environment to easily scale WP and 2. A host … Read more
It sounds like you may be running a plugin that stores too many transient options. If you can’t currently access wp-admin, try FTP’ing in and renaming your /plugins folder to disable all plugins. Then you should be able to log in to wp-admin. Next, back in FTP rename your /plugins folder back to the normal … Read more
Your files should be owned by your account. Period. They should not be owned by the “apache” user. This is insecure. The files may need to be readable by the apache user. The recommended permissions are 755 for folders and 644 for files. With the exception of the wp-config.php file, which should be set to … Read more
How to configure sub-domain for images on Debian Apache VPS?