Re: [PATCH] remote: systemd: Remove unix sockets from filesystem when disabling a '.socket' unit

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On Tue, 18 Jan 2022, Peter Krempa wrote:

> The existence of the unix socket path is used by the remote driver to
> determine whether modular daemons are in use, so if the socket file
> stays behind and the user decided to switch from modular to monolithic
> daemon which was socket activated, the remote driver will insist on
> picking '/var/run/libvirt/virtqemud-sock', even when it's no longer in
> use:
>
>  # systemctl start libvirtd.service
>  # virsh list
>   Id   Name   State
>  --------------------
>
>  # systemctl stop libvirtd.service
>  Warning: Stopping libvirtd.service, but it can still be activated by:
>    libvirtd.socket
>    libvirtd-ro.socket
>    libvirtd-admin.socket
>  # systemctl start virtqemud.socket
>  # virsh list
>   Id   Name   State
>  --------------------
>
>  # systemctl stop virtqemud.socket
>  # systemctl start libvirtd.service
>  # virsh list
>  error: failed to connect to the hypervisor
>  error: Failed to connect socket to '/var/run/libvirt/virtqemud-sock': Connection refused
>
>  # virsh -c 'qemu:///system?socket=/var/run/libvirt/libvirt-sock' list
>   Id   Name   State
>  --------------------
>
> Fix this by instructing systemd to delete the socket file when
> deactivating the unit file for the socket.
>
> Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>

Reviewed-by: Ani Sinha <ani@xxxxxxxxxxx>

> ---
>  src/remote/libvirtd.socket.in | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/src/remote/libvirtd.socket.in b/src/remote/libvirtd.socket.in
> index 85b4aa800a..0f349656f5 100644
> --- a/src/remote/libvirtd.socket.in
> +++ b/src/remote/libvirtd.socket.in
> @@ -9,6 +9,7 @@ Before=@service@.service
>  ListenStream=@runstatedir@/libvirt/@sockprefix@-sock
>  Service=@service@.service
>  SocketMode=@mode@
> +RemoveOnStop=yes
>
>  [Install]
>  WantedBy=sockets.target
> --
> 2.34.1
>
>




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