Domains domain can not be accessed

did you setup domain DNS properly for A records to server IP ? check with Global DNS Propagation Checker - What's My DNS?

if ssh access is also blocked could be your ISP IP has been blocked by CSF Firewall ? do you have static IP address for your local ISP or dynamic ISP IP address ?

Similar to Sysadmin - Locked myself out due to CSF? How long is the IP blocked?

more info might be helpful

1. What version of Centmin Mod ? .08 stable or .09 beta ? If .09 beta when was it installed and when was last time you updated the code ?
2. What's your VPS/Server hardware specifications ? Xen/KVM/OpenVZ ? cpu type ? memory available ? disk space ? OS and version ? i.e. CentOS 6.10 or 7.5 ?
3. Who's your web host ?
4. Your ISP ip address static/dynamic ?
5. What were you doing connection wise to your server leading up to the blockage ?
6. If you're on dynamic ip, you may need additional steps CSF Firewall as per Getting Started Guide step 4
7. Other steps: Does your web host offer out of band VNC/KVM/IPMI Console access? If you can, check if you ips are blocked using csf -g grep command
   
   Code:

   csf -g YOURIPADDRESS

   commands you can see for csf via
   
   Code:

   csf -h

   whitelist your ISP range of ips if you know the range
   
   Code:

   csf -a IPADDRESSORRANGE

   remove temp and permanent blocks from csf
   
   Code:

   csf -tr IPADDRESS
   csf -dr IPADDRESS

   also check CSF /var/log/lfd.log for clues
   
   Code:

   tail -50 /var/log/lfd.log

   another log is /var/log/messages you can grep it for your ips
   
   Code:

   grep IPADDRESS /var/log/messages

   and your /var/log/secure
   
   Code:

   tail -20 /var/log/secure

Do you have a VPN connection you can use ? Try using that to SSH into your server. If you have VPN like private one with dedicated IP, you can also whitelist that VPN IP in CSF Firewall. That's what i usually do so have multiple avenues to connect to server via SSH.

If you use DigitalOcean or solusVM based web host VPS they have consoles you can use to connect to your server out of band so you can access your server SSH and unblock yourself from CSF Firewall if needed. Once SSH'd in via console, check if your ISP IP has been blocked by

grepping csf firewall ips

Code (Text):

csf -g ISPIPADDRRESS

if blocked remove your ISP IP address from /etc/csf/csf.deny and restart CSF Firewall
or via command

Code (Text):

csf -dr ISPIPADDRESS

• DigitalOcean Console How To Use the DigitalOcean Console to Access your Droplet | DigitalOcean
• Linode Lish Using the Linode Shell (Lish)
• How to manage your VPS with SolusVM (for KVM) - Hosting - Namecheap.com

 

haven't used online.net myself but those servers should have out of band console access via KVM over IP to be able to log back into your server to troubleshoot CSF Firewall as per above steps KVM over IP [Documentation - Online.net]

assuming of course you setup domain DNS A records correctly - can test via Global DNS Propagation Checker - What's My DNS? and that you created nginx vhosts for those domains via centmin.sh menu option 2 or 22

 

these ultimately affect how many concurrent connections/requests nginx will be able to handle

FYI, CPU load optimal is 1.0 per cpu thread so 8 cpu thread normal = 8x1 = 8.0. 16 cpu server normal is 16x1 = 16.0

so cpu load of 8 for

• 2 cpu server = 8/2 = 4.0 load average
• 4 cpu server = 8/4 = 2.0 load average
• 8 cpu server = 8/8 = 1.0 load average

When you type top command, hit number 1 to break down per cpu stats

Centmin Mod is provided as is, so troubleshooting load issues is left to end user to do. However, there's many linux tools and scripts that can help you figure out what was causing the load issues and when.

If you're providing info on this forum, more info might be helpful

1. What's your VPS/Server hardware specifications ? cpu type ? memory available ? disk space ?
2. Who's your web host ? Different hosts have different limits for server resource usage and some are more restrictive that others so it could just be their resource usage policy you tripped which may or may not be restrictive. If restrictive, then real solution would be finding a better web host. If not restrictive, then it's finding out what caused high cpu load.
3. If running Centmin Mod 123.09beta01 or higher, you will have access to a cminfo top command which can also provide a summary of statistics - some of which are explained in info and linked articles below.

Tools and commands you will want to read up on and learn for basic system admin tasks and troubleshooting.

• 20 Command Line Tools to Monitor Linux Performance
• 13 Linux Performance Monitoring Tools - Part 2
• 80 Linux Monitoring Tools for SysAdmins - Server Density Blog
• Amazing ! 25 Linux Performance Monitoring Tools
• 20 Linux System Monitoring Tools Every SysAdmin Should Know
• My mysqlmymonlite.sh script can help with that mysqlmymonlite.sh Addon | Centmin Mod Community README text file has instructions for setting up a cronjob to email you reports i.e. every 10/15min or every hour.

Notes:

• Centmin Mod already installed Glances tool. It can be invoked from SSH command glances or top2. Official Glances site at nicolargo.github.io/glances/ and documentation here.

For example what's output for these commands

Code (Text):

top -bn1

Code (Text):

ps aufxw

Code (Text):

sar -q

Code (Text):

sar -r

Code (Text):

sar -q -f /var/log/sa/sa$(date +%d -d yesterday)

Code (Text):

sar -r -f /var/log/sa/sa$(date +%d -d yesterday)

If you want to look at per process usage stats use pidstat run pidstat every 1 sec for 5 runs and sed is just to replace your main hostname with word hostname so mask your domain for posting on public places

Code (Text):

pidstat -durh 1 5 | sed -e "s|$(hostname)|hostname|g"

for posting code you might want to use CODE tags for code How to use forum BBCODE code tags