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--- linux:netns [2025/08/15 16:27] – jonathan
+++ linux:netns [2025/08/15 16:55] (current) – jonathan
@@ Line 1: / Line 1: @@
 ===== Linux - NETNS =====
+This Bash script creates three separate Linux network namespaces (instance1, instance2, and instance3), assigns a specific physical interface to each, configures their IPv4/IPv6 addresses and default routes, and sets custom DNS resolvers for each namespace.
-<code - instances-netns.sh>
+<code - /usr/local/share/instances-netns.sh>
 #!/bin/bash
 ip netns add instance1
@@ Line 34: / Line 34: @@
 echo -e "nameserver 8.8.8.8\nnameserver 8.8.4.4" | sudo tee /etc/netns/instance3/resolv.conf > /dev/null
 </code>
+\\
+This Bash script displays the network interface details, IPv4/IPv6 addresses, and routing tables for three network namespaces (instance1, instance2, and instance3) in a formatted, sectioned output.
 <code - show-netns-settings.sh>
 #!/bin/bash
@@ Line 76: / Line 77: @@
 echo "################################################"
 </code>
+\\
+This script opens firefox-esr in three different network namespaces (instance1, instance2, instance3), each using its own browser profile and with proxy settings disabled.
 <code - netns-firefox.sh>
 #####Note that it isn't compatible with Firefox snap version. The firefox-esr must be installed.#####
@@ Line 91: / Line 93: @@
 env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY firefox-esr --new-instance --profile $HOME/.mozilla/instance3
 </code>
+\\
+This script runs speedtest-cli inside three network namespaces (instance1, instance2, instance3) with proxy variables cleared, allowing separate network speed tests for each namespace.
 <code - netns-speedtest.sh>
 #!/bin/bash
@@ Line 102: / Line 105: @@
 sudo /usr/sbin/ip netns exec instance3 env http_proxy="" https_proxy="" \
 sudo -u $USER \ speedtest-cli
+</code>
+\\
+This systemd unit file defines a one-shot service that runs the /usr/local/share/instances-netns.sh script at boot after the network is up and remains marked active after execution.
+<code - /etc/systemd/system/instances-netns.service>
+[Unit]
+Description=Run CPE Netns Script at Boot
+After=network.target
+[Service]
+Type=oneshot
+ExecStart=/usr/local/share/instances-netns.sh
+RemainAfterExit=yes
+[Install]
+WantedBy=multi-user.target
+</code>
+\\
+These commands reload systemd to recognize new or changed units, enable the instances-netns.service to start at boot, and start the service immediately.
+<code - Activate the new service>
+sudo systemctl daemon-reload
+sudo systemctl enable instances-netns.service
+sudo systemctl start instances-netns.service
 </code>