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redis-ha: fix busybox-ash-ism in redis_liveness.sh
The ${response:0:7} syntax is non-POSIX and not understood by Debian's dash shell, so if a Debian-based Redis image is used the liveness check breaks on slaves. A case statement makes this check more legible anyway, in my opinion, and works in all the POSIX-compatible shells (busybox ash, dash, and bash). Signed-off-by: Chris Boot <[email protected]>
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