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The system admins team of xFusionCorp Industries has noticed intermittent issues with DNS resolution in several apps . App Server 2 in Stratos Datacenter is having some DNS resolution issues, so we want to add some additional DNS nameservers on this server.

As a temporary fix we have decided to go with Google public DNS (ipv4). Please make appropriate changes on this server.

Solution

Step 1: Connect to App Server 2 (stapp02)


ssh steve@stapp02
# Password: Am3ric@

Step 2: Switch to root


sudo su -
# Password: Am3ric@

Step 3: Check current DNS configuration


cat /etc/resolv.conf

Step 4: Add Google Public DNS nameservers


Google Public DNS IPv4 addresses:

  • 8.8.8.8 (Primary)
  • 8.8.4.4 (Secondary)

# Add Google DNS servers to resolv.conf
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf

Step 5: Verify the configuration


cat /etc/resolv.conf

Step 6: Test DNS resolution


# Test with ping
ping -c 2 google.com

# Test with nslookup
nslookup google.com

# Test with dig
dig google.com

One-Line Commands

From jump host with password:


echo 'Am3ric@' | ssh steve@stapp02 "sudo -S bash -c 'echo \"nameserver 8.8.8.8\" >> /etc/resolv.conf && echo \"nameserver 8.8.4.4\" >> /etc/resolv.conf && cat /etc/resolv.conf'"

Using heredoc (Recommended):


ssh steve@stapp02 << 'EOF'
echo 'Am3ric@' | sudo -S bash -c '
echo "=== Current DNS configuration ==="
cat /etc/resolv.conf

echo ""
echo "=== Adding Google Public DNS ==="
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf

echo ""
echo "=== Updated DNS configuration ==="
cat /etc/resolv.conf

echo ""
echo "=== Testing DNS resolution ==="
ping -c 2 google.com
'
EOF

Step-by-Step Interactive Commands


# Connect to stapp02
ssh steve@stapp02
# Password: Am3ric@

# Become root
sudo su -
# Password: Am3ric@

# Step 1: Check current DNS configuration
echo "=== Current DNS configuration ==="
cat /etc/resolv.conf

# Step 2: Backup existing resolv.conf (optional but recommended)
echo "=== Backing up resolv.conf ==="
cp /etc/resolv.conf /etc/resolv.conf.backup

# Step 3: Add Google DNS servers
echo "=== Adding Google Public DNS ==="
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf

# Step 4: Verify the changes
echo "=== Updated DNS configuration ==="
cat /etc/resolv.conf

# Step 5: Test DNS resolution
echo "=== Testing DNS resolution ==="
ping -c 2 google.com
nslookup google.com

# Exit
exit
exit

Expected Output


[root@stapp02 ~]# cat /etc/resolv.conf
nameserver 10.0.0.2

[root@stapp02 ~]# echo "nameserver 8.8.8.8" >> /etc/resolv.conf
[root@stapp02 ~]# echo "nameserver 8.8.4.4" >> /etc/resolv.conf

[root@stapp02 ~]# cat /etc/resolv.conf
nameserver 10.0.0.2
nameserver 8.8.8.8
nameserver 8.8.4.4

[root@stapp02 ~]# ping -c 2 google.com
PING google.com (142.250.192.46) 56(84) bytes of data.
64 bytes from 142.250.192.46: icmp_seq=1 ttl=115 time=10.2 ms
64 bytes from 142.250.192.46: icmp_seq=2 ttl=115 time=10.5 ms

--- google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms

[root@stapp02 ~]# nslookup google.com
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
Name: google.com
Address: 142.250.192.46

Alternative Methods

Method 1: Using tee command


echo "nameserver 8.8.8.8" | sudo tee -a /etc/resolv.conf
echo "nameserver 8.8.4.4" | sudo tee -a /etc/resolv.conf

Method 2: Using cat with heredoc


cat >> /etc/resolv.conf << EOF
nameserver 8.8.8.8
nameserver 8.8.4.4
EOF

Method 3: Using sed to replace existing nameservers


sed -i 's/^nameserver.*/nameserver 8.8.8.8/' /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf

Method 4: Using nmcli (NetworkManager)


# Check connection name
nmcli connection show

# Add DNS servers
nmcli connection modify <connection-name> ipv4.dns "8.8.8.8 8.8.4.4"
nmcli connection up <connection-name>

Method 5: Using nmtui (Text User Interface)


nmtui
# Navigate to Edit a connection
# Select the connection
# Add DNS servers
# Save and exit

Verification Commands


# 1. Check resolv.conf
cat /etc/resolv.conf

# 2. Test DNS resolution with ping
ping -c 2 google.com

# 3. Test with nslookup
nslookup google.com

# 4. Test with dig
dig google.com

# 5. Test with host
host google.com

# 6. Check DNS resolution order
getent hosts google.com

# 7. Check if DNS servers are reachable
ping -c 2 8.8.8.8
ping -c 2 8.8.4.4

Understanding Google Public DNS

Google Public DNS IPv4 Addresses

AddressDescription
8.8.8.8Primary DNS
8.8.4.4Secondary DNS

Google Public DNS IPv6 Addresses

AddressDescription
2001:4860:4860::8888Primary DNS
2001:4860:4860::8844Secondary DNS

Why Use Google Public DNS


  • Reliability: Highly available and globally distributed
  • Speed: Fast resolution times
  • Security: DNSSEC validation and protection against DNS poisoning
  • Privacy: No logging of personal information
  • Free: Available to everyone at no cost


Important Notes

resolv.conf May Be Overwritten


On systems using NetworkManager or DHCP, /etc/resolv.conf may be automatically overwritten. To make changes permanent, consider these approaches.

Option 1: Use NetworkManager

nmcli connection modify <connection-name> ipv4.dns "8.8.8.8 8.8.4.4"
nmcli connection modify <connection-name> ipv4.ignore-auto-dns yes
nmcli connection up <connection-name>

Option 2: Make resolv.conf immutable

chattr +i /etc/resolv.conf
# To undo: chattr -i /etc/resolv.conf

Option 3: Configure in network interface file

# For RHEL/CentOS
vi /etc/sysconfig/network-scripts/ifcfg-<interface>
# Add: DNS1=8.8.8.8
# Add: DNS2=8.8.4.4

Troubleshooting


  1. "Permission denied" when editing resolv.conf:

# Use sudo or become root
sudo su -


  1. DNS still not resolving:

# Check if DNS servers are reachable
ping -c 2 8.8.8.8

# Check network connectivity
ping -c 2 8.8.4.4

# Restart network service
systemctl restart NetworkManager


  1. resolv.conf changes not persisting:

# Check if NetworkManager is managing resolv.conf
ls -la /etc/resolv.conf

# If symlink to NetworkManager, configure via nmcli
nmcli connection modify <connection> ipv4.dns "8.8.8.8 8.8.4.4"


  1. DNS resolution slow:

# Check which DNS server is being used
nslookup google.com

# Check DNS response time
dig google.com | grep "Query time"


  1. Cannot reach Google DNS:

# Check firewall rules
firewall-cmd --list-all

# Allow DNS traffic
firewall-cmd --add-service=dns --permanent
firewall-cmd --reload

Complete Script (Run from Jump Host)


#!/bin/bash

echo "========================================="
echo "Configuring Google Public DNS"
echo "========================================="

ssh steve@stapp02 << 'EOF'
echo 'Am3ric@' | sudo -S bash -c '
echo ""
echo "=== Current DNS Configuration ==="
cat /etc/resolv.conf

echo ""
echo "=== Backing up resolv.conf ==="
cp /etc/resolv.conf /etc/resolv.conf.backup

echo ""
echo "=== Adding Google Public DNS ==="
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf

echo ""
echo "=== Updated DNS Configuration ==="
cat /etc/resolv.conf

echo ""
echo "=== Testing DNS Resolution ==="
ping -c 2 google.com

echo ""
echo "========================================="
echo "✅ Google Public DNS configured successfully!"
echo "📌 Primary DNS: 8.8.8.8"
echo "📌 Secondary DNS: 8.8.4.4"
echo "========================================="
'
EOF

Summary


  • Google Public DNS added: 8.8.8.8 and 8.8.4.4
  • Configuration file: /etc/resolv.conf
  • DNS resolution tested: Working correctly
  • Backup created: /etc/resolv.conf.backup

The DNS configuration on App Server 2 has been updated to use Google Public DNS as a temporary fix for the intermittent DNS resolution issues.#linux #software #coding #development #engineering #inclusive #community

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