Talk:Network Environment

From BCCD 3.0

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= Stage descriptions =
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= Stages =
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== Stage descriptions ==
BCCD goes through the following network configuration stages:
BCCD goes through the following network configuration stages:
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# Can <b><code>bccd-reset-network</code></b> be rewritten to produce <code>systemd.network</code> configuration files via templates for each stage?
# Can <b><code>bccd-reset-network</code></b> be rewritten to produce <code>systemd.network</code> configuration files via templates for each stage?
# How do we detect that a BCCD DHCP server has ''not'' responded to a client, and obtain an address from any DHCP server?
# How do we detect that a BCCD DHCP server has ''not'' responded to a client, and obtain an address from any DHCP server?
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== Stage configuration ==
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Current testing files:
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* Head node
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** <code>/etc/systemd/network/10-dhcp-eth0.network</code>
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<pre>
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[Match]
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Name=eth0
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[Network]
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DHCP=yes
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</pre>
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** <code>/etc/systemd/network/20-static-eth1.network</code>
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<pre>
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[Match]
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Name=eth1
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[Network]
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Address=192.168.3.1/24
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DHCP=no
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</pre>
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= systemd notes =
= systemd notes =

Revision as of 01:58, 14 May 2019

Contents

Stages

Stage descriptions

BCCD goes through the following network configuration stages:

  1. Live mode
    1. Initial boot:
      1. Try to obtain an IP address from a BCCD DHCP server
      2. If no BCCD DHCP servers are available, obtain an IP address from any DHCP server
    2. Head node: Upon user request, start DHCP server that will answer requests only from other BCCD systems
  2. Liberated mode
    1. Initial boot:
      1. Try to obtain an IP address from a BCCD DHCP server
      2. If no BCCD DHCP servers are available, obtain an IP address from any DHCP server
    2. Diskless boot: Upon user request, start DHCP server that will answer requests from diskless BCCD systems on only a given interface

Open questions:

  1. Should we continue using bccd-identifier or switch to using the standard vendor-class-identifier that can be provided via systemd.network?
  2. Can bccd-reset-network be rewritten to produce systemd.network configuration files via templates for each stage?
  3. How do we detect that a BCCD DHCP server has not responded to a client, and obtain an address from any DHCP server?

Stage configuration

Current testing files:

[Match]
Name=eth0

[Network]
DHCP=yes
[Match]
Name=eth1

[Network]
Address=192.168.3.1/24
DHCP=no


systemd notes

systemd commands

Restart networking 
systemctl restart systemd-networkd
Networking status 
networkctl

systemd tricks

Troubleshooting

RTNETLINK answers: File exists

If you get an error like this:

RTNETLINK answers: File exists
Failed to bring up eth1.

Try flushing that interface and replumbing it:

$ sudo ip addr flush dev eth1
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