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Add waiting on hosts in docker entrypoint for distributed setups. (#4244)

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Thanks to Remco Verhoef <remco@dutchcoders.io> for the script.

Fixes #4225
This commit is contained in:
Harshavardhana 2017-05-04 00:48:13 -07:00 committed by GitHub
parent 069cf9e8aa
commit 0ea8bfaf78
1 changed files with 43 additions and 5 deletions
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48
buildscripts/docker-entrypoint.sh
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@ -15,15 +15,50 @@
# limitations under the License.
#
# if command starts with an option, prepend minio
# If command starts with an option, prepend minio.
if [ "${1}" != "minio" ]; then
if [ -n "${1}" ]; then
set -- minio "$@"
fi
fi
## Look for swarm secrets in default location.
file_env() {
# Wait for all the hosts to come online and have
# their DNS entries populated properly.
docker_wait_hosts() {
hosts="$@"
num_hosts=0
# Count number of hosts in arguments.
for host in $hosts; do
[ $(echo "$host" | grep -E "^http") ] || continue
num_hosts=$((num_hosts+1))
done
if [ $num_hosts -gt 0 ]; then
echo -n "Waiting for all hosts to resolve..."
while true; do
x=0
for host in $hosts; do
[ $(echo "$host" | grep -E "^http") ] || continue
# Extract the domain.
host=$(echo $host | sed -e 's/^http[s]\?:\/\/\([^\/]\+\).*/\1/')
echo -n .
val=$(ping -c 1 $host 2>/dev/null)
if [ $? != 0 ]; then
echo "Failed to lookup $host"
continue
fi
x=$((x+1))
done
# Provided hosts same as successful hosts, should break out.
test $x -eq $num_hosts && break
echo "Failed to resolve hosts.. retrying after 1 second."
sleep 1
done
echo "All hosts are resolving proceeding to initialize Minio."
fi
}
## Look for docker secrets in default documented location.
docker_secrets_env() {
local MINIO_ACCESS_KEY_FILE="/run/secrets/access_key"
local MINIO_SECRET_KEY_FILE="/run/secrets/secret_key"
@ -37,7 +72,10 @@ file_env() {
fi
}
## Set env if necessary.
file_env
## Set access env from secrets if necessary.
docker_secrets_env
## Wait for all the hosts to come online.
docker_wait_hosts "$@"
exec "$@"