Category: Sysadmin

How Vlan works in plain language

To understand how VLANs work, let’s consider VLAN applications in a traditional IT environment, where physical hosts are attached to a physical switch, and no virtualization is involved. Imagine a scenario where you want three isolated networks but you only have a single physical switch. The network administrator would choose three VLAN IDs, for example,… Continue reading How Vlan works in plain language

Docker under the hood

Many people think that docker is a kind of monolithic system and they hardly understand how internally it works. see the figure below

ipmitool dev not found

modprobe ipmi_devintf modprobe ipmi_si You can add these to /etc/modules to have them loaded automatically (just list the module names): ipmi_devintf ipmi_si

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Categorized as Sysadmin

linux gateway

iptables -A FORWARD -i eth1 -j ACCEPT iptables -A FORWARD -o eth1 -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE #ETHO where internet is connected