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Add Alpine package slirp4netns to dind-rootless
Rootlesskit's default network driver is vpnkit. With this package added, slirp4netns can be selected as an alternative by starting the container with "-e DOCKERD_ROOTLESS_ROOTLESSKIT_NET=slirp4netns". Signed-off-by: Rob Murray <rob.murray@docker.com>
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‎28/dind-rootless/Dockerfile‎

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‎Dockerfile-dind-rootless.template‎

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@@ -3,7 +3,8 @@ FROM docker:{{ env.version }}-dind
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# busybox "ip" is insufficient:
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# [rootlesskit:child ] error: executing [[ip tuntap add name tap0 mode tap] [ip link set tap0 address 02:50:00:00:00:01]]: exit status 1
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RUN apk add --no-cache iproute2 fuse-overlayfs
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# slirp4netns can be selected as rootlesskit's net driver using "-e DOCKERD_ROOTLESS_ROOTLESSKIT_NET=slirp4netns"
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RUN apk add --no-cache iproute2 fuse-overlayfs slirp4netns
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# "/run/user/UID" will be used by default as the value of XDG_RUNTIME_DIR
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RUN mkdir /run/user && chmod 1777 /run/user

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