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6d50e67bd2
When a Scylla node starts, the scylla-image-setup.service invokes the `scylla_swap_setup` script to provision swap. This script allocates a swap file and creates a swap systemd unit to delegate control to systemd. By default, systemd injects a Before=swap.target dependency into every swap unit, allowing other services to use swap.target to wait for swap to be enabled. On Azure, this doesn't work so well because we store the swap file on the ephemeral disk [1] which has network dependencies (`_netdev` mount option, configured by cloud-init [2]). This makes the swap.target indirectly depend on the network, leading to dependency cycles such as: swap.target -> mnt-swapfile.swap -> mnt.mount -> network-online.target -> network.target -> systemd-resolved.service -> tmp.mount -> swap.target This patch breaks the cycle by removing the swap unit from swap.target using DefaultDependencies=no. The swap unit will still be activated via WantedBy=multi-user.target, just not during early boot. Although this problem is specific to Azure, this patch applies the fix to all clouds to keep the code simple. Fixes #26519. Fixes SCYLLADB-1257 [1] https://github.com/scylladb/scylla-machine-image/pull/426 [2] https://github.com/canonical/cloud-init/pull/1213#issuecomment-1026065501 Signed-off-by: Nikos Dragazis <nikolaos.dragazis@scylladb.com> Closes scylladb/scylladb#28504