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Add the ability for operators of natc in consensus mode to remove
servers from the raft cluster config, without losing other state.
Updates #14667
Signed-off-by: Fran Bull <fran@tailscale.com>
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Currently consensus has a bootstrap routine where a tsnet node tries to
join each other node with the cluster tag, and if it is not able to join
any other node it starts its own cluster.
That algorithm is racy, and can result in split brain (more than one
leader/cluster) if all the nodes for a cluster are started at the same
time.
Add a FollowOnly argument to the bootstrap function. If provided this
tsnet node will never lead, it will try (and retry with exponential back
off) to follow any node it can contact.
Add a --follow-only flag to cmd/natc that uses this new tsconsensus
functionality.
Also slightly reorganize some arguments into opts structs.
Updates #14667
Signed-off-by: Fran Bull <fran@tailscale.com>
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Which can make operating the service more convenient.
It makes sense to put the cluster state with this if specified, so
rearrange the logic to handle that.
Updates #14667
Signed-off-by: Fran Bull <fran@tailscale.com>
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Fixes #16027
Signed-off-by: Fran Bull <fran@tailscale.com>
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Enable nat connector to be run on a cluster of machines for high
availability.
Updates #14667
Signed-off-by: Fran Bull <fran@tailscale.com>
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perPeerState no longer needs to know the v6ULA.
Updates #14667
Signed-off-by: Fran Bull <fran@tailscale.com>
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Because we derive v6 addresses from v4 addresses we only need to store
the v4 address, not both.
Updates #14667
Signed-off-by: Fran Bull <fran@tailscale.com>
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Adds IPPool and moves all IP address management concerns behind that.
Updates #14667
Signed-off-by: Fran Bull <fran@tailscale.com>
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