Latest Server related questions

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Alexander Guyer avatar
Best way to enable DDoS protection on many individual GCP compute instances without load balancing?
ph flag

I've been scouring through the Google Cloud Armor docs for information about DDoS protection of a GCP compute VM instance. From what I've found, Google Cloud Armor Managed Protection provides traditional DDoS protection (perhaps layer 3 and layer 4), and it must be attached to a load balancer. Additionally, Google Cloud Armor Adaptive Protection provides layer 7 protection via machine-learning-based anoma ...

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are there popular vps orchestration tools similar to kubernetes but for non-container environments?
gi flag

I'm in the process of learning kubernetes and docker swarm. I really appreciate how you can create several servers as work nodes and cluster/swarm them together. Then use commands like kubectl get pods or docker ps -a to see all pods/containers across all services connected to the same cluster/swarm.

This got me wondering if:

  1. Is it a popular to run database and node js apps across VPS instances ...
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Python 123 avatar
Postfix mail server not sending email
fr flag

I had a postfix server that I had to restore from a backup and deploy onto a new server. Using the new server, the domain name is not allowing me to send email. I am able to receive emails but sending them just never delivers them to the receiver. How can I troubleshoot and solve this issue? Thanks!

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Renuka Manavalan avatar
systemd fails to restart even after calling reset-failed
cn flag

We have a need for restarting a service frequently in certain special scenarios. So when it fails with start-limit, the suggested solution is to call "reset-failed". What we found is that, even after calling reset-failed, the immediate subsequent start do fail with start limit. The only work around is to introduce a pause of 6 seconds (sleep 6) before calling start, if previous has failed.

For te ...

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IAM Profile allows create VPC IPV6 Subnet in some regions. Why does it fail in other regions?
br flag

In a test environment to mockup a larger issue, I have an IAM user with a directly attached IAM profile. I have also tried with the profile attached to an IAM Role which the IAM user has assumed.

The profile allows CloudFormation to create a VPC with IPv6CidrBlock and IPv6Cidr subnet. This cloud stack always is created fine in us-east-1 and some other regions. Upon further testing other regions a ...

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Make special query log for a certain zone bind9
in flag

How do I make special query log file from a certain zone.

While my current log config is

logging {
        channel query_logging {
                file "/var/log/named/query.log" versions 5>
                //severity debug 1;
                print-time yes;
                //print-severity yes;
                //print-category yes;
        };

        category queries {
                query_loggi ...
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Sergey Ponomarev avatar
Lighttpd Execute ./cgi-bin/index.cgi if exists in the folder
us flag

BusyBox httpd executes the ./cgi-bin/index.cgi if it exists. This is similar to index.php but with the /cgi-bin/ folder. So for example I have the structure:

/api/
  cgi-bin/index.cgi
/blog/
  cgi-bin/index.cgi
  /rss/
    cgi-bin/index.cgi

So when request are going to http://example.com/api/ they are actually handled by the /www/api/cgi-bin/index.cgi script. When requested http://example.com/blog/ ...

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Gilberto Martins avatar
Large number of RST/ACK packages from my Ruby on Rails server
cn flag

I have a Rails server (ROR) behind my Firewall (FWL). ROR must constantly send information to Digital Ocean Spaces (DOS). Note that ROR is not in Digital Ocean datacenter.

ROR <--> FWL <--> Internet <--> DOS

My firewall has the following rule:

# Only register invalid FORWARD packages
${IPT} -A FORWARD -m conntrack --ctstate INVALID -j LOG --log-level alert --log-prefix 'DROP FOR ...
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MadHatter avatar
vsFTP not following linux groups for writing
fr flag

vsFTP seems to not obey Linux (Ubuntu 16) groups for write permission.
I have 2 user accounts: "ftp_user", "ftpuser". Both are in "ftp" group. Both accounts are chroot, there home directories are /ftp. Neither has shell access.

/ftp
   ./folder1
   ./folder2
   ..
   ...

directory: drwxrwxrwx+ nobody ftp ftp
sub-directory: drwxrwxrwx+ ftp_user ftp folder1

Issue at hand:
only ftp_user c ...

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Azure VM Domain Verification
ke flag

I have an Azure VM let's say myvm.cloudapp.azure.com. It is accessible using http://myvm.cloudapp.azure.com . Now I wanna make it secure https://myvm.cloudapp.azure.com. I have added certificate App Service Certificate, now I need Domain Verification.

enter image description here

How can I verify the domain?

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Domain Controller Communication Timeout Limit
cn flag

THE DOMAIN

I have a domain setup with a parent/child schema. All servers are Microsoft Windows 2019 Standard. There are 2 top level DCs and the 2 child domains each have their own 2 DCs. The issue I am having happens maybe once a month when we do testing. We have encryption software on the computer whereas we forget to set the autologon flag during patching some times and the computer stops pre OS b ...

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Route all traffic to docker except tun0
in flag

I want to connect to a primary VPN (tun0) and use secondary vpn (docker) over it. How can route my host traffic to docker except primary VPN (tun0) traffic

I can't use vpn-chain instead of docker, the secondary VPN is Lokinet. Primary VPN however is an OpenVPN profile with static IP remote server address

Current route output:

$ route 
Kernel IP routing table
Destination     Gateway         Genmask  ...
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custom tinc setup in pfsense withut webgui
vn flag

I have a running a tinc VPN (Layer3, Mode=router) with dozents of hosts, most with multiple IPs and Subnets. Currently all running Linux and the hosts-files are synchronized by rsync (StrictSubnets=yes). Works fine.

Now I like to add a pfsense host in this mesh. I installed the tinc package on pfsense, but in the webgui I am not able to configure this correctly. It looks like the gui is made only ...

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pvdisplay does not show the one lvm volume
il flag

Need your help for finding the one volume. i need to migrate the particular volume , but i am not able to get that particular volume. it was mounted on filesystem. but when we check the pvdisplay command, it does not show.

the LUN(wwn) has configured in multipath -

[root@server1 ~]# multipath -ll 360002ac00000fsdfwee00012c6d

azure_mig (360002ac00000fsdfwee00012c6d) dm-79 3PARdata,VV
size=400G feature ...
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Determining if varnish config changes are needed after adding 3 new cookies
mx flag
# Keep all these cookie
if (req.http.Cookie) {
  set req.http.Cookie = ";" + req.http.Cookie;
  set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
  set req.http.Cookie = regsuball(req.http.Cookie, ";(location|usertype|viewed-products)=", "; \1=");
  set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");
  set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");

  if ...
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Unable to connect to Lightsail, is there a way to fix it?
bq flag

After configuring and rebooting a Debian 10 with internal ip address as static I cannot connect with it.

The only strange thing that I've found was:

enter image description here

The internal ip address was 172.26.5.8/20

I cannot reach in anyway but if I ping even not responding, there is an entry in cache arp:

enter image description here

I wonder if there is a way to fix it or if there is an alternative way of reaching the instance.

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