Restrict a process to read "/etc/resolv.conf" file in linux

Restrict a process to read "/etc/resolv.conf" file in linux

By : Annadote
Date : September 23 2020, 03:00 PM
will help you It is not easy to prevent the access to /etc/resolv.conf. But you can tell the resolver the number of attempts to perform for DNS name resolving through the environment variable RES_OPTIONS. Even zero attempts are a valid value there and causes name resolution to fail instantly.
See for example:
code :
RES_OPTIONS="attempts:0" telnet www.google.de
telnet: could not resolve www.google.de/telnet: Temporary failure in name resolution

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DHCP overwrites Cisco VPN resolv.conf on Linux

DHCP overwrites Cisco VPN resolv.conf on Linux

By : user218795
Date : March 29 2020, 07:55 AM
With these it helps If you are using the Ubuntu default with NetworkManager, try removing the CiscoVPN client and use the NetworkManager vpnc plugin to connect to the Cisco VPN. This should avoid all problems, since NetworkManager then knows about your VPN connection.
Linux: How do i edit resolv.conf

Linux: How do i edit resolv.conf

By : naga.v
Date : March 29 2020, 07:55 AM
I hope this helps . Your system uses resolvconf, so the resolv.conf file is replaced by a symbolic link to /etc/resolvconf/run/resolv.conf and resolvconf dynamically generated the file. That's why DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
To properly update the information in the file, you can put the dns-* parameters in /etc/network/interfaces e.g.
code :
auto eth0
iface eth0 inet static
     dns-search example.com
$ resolvconf -d eth0
$ resolvconf -a eth0
    $ rm /etc/resolv.conf         ;# to remove the symlink
    $ vi /etc/resolv.conf         ;# to create a regular file
how to write filter conf file in logstash to read myCustomLogFile with "|" seprator and key=value

how to write filter conf file in logstash to read myCustomLogFile with "|" seprator and key=value

By : user3293678
Date : March 29 2020, 07:55 AM
like below fixes the issue Use the kv filter:
code :
filter {
  kv {
    field_split => "|"
filter {
  kv {
    field_split => "|"
    remove_field => ["message"]
  date {
    match => ["time", "YYYY-MM-dd HH:mm:ss"]
    remove_field => ["time"]
mutate {
  convert => {
    "loc" => "integer"
    "rule" => "integer"
    "s_port" => "integer"
    "service" => "integer"
Reading from file /etc/resolv.conf and populating in named.conf.options

Reading from file /etc/resolv.conf and populating in named.conf.options

By : mike
Date : March 29 2020, 07:55 AM
To fix the issue you can do An exec will always run unless it has something to limit it. There are a number of parameters you can set.
In your case, it sounds like you want the exec to run only when your file changes. You might want to use the refreshonly parameter on your exec.
code :
file { '/etc/bind/named.conf.options':
    ensure  => present,
    content => template('my_template_location/named.conf.options.erb'),
    replace => true,
exec { "add_nameserver":
    command     => '/bin/sed -i "s/<name_server>/$(grep nameserver/etc/resolv.conf | tr -d [a-z])/g" /etc/bind/named.conf.options',
    refreshonly => true,
Kubernetes DNS lookup issue and "invalid" in the /etc/resolv.conf file

Kubernetes DNS lookup issue and "invalid" in the /etc/resolv.conf file

By : johnny applesauce
Date : March 29 2020, 07:55 AM
To fix the issue you can do As configured in CoreDNS ConfigMap default upstream nameservers are inherited from node, that is everything outside the cluster domain (.cluster.local)
So "invalid" is an entry copied from Node's /etc/resolv.conf file during Pod creation.
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