108 lines
3.8 KiB
Bash
108 lines
3.8 KiB
Bash
#!/bin/sh
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set -e
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count_tasks() {
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getent hosts tasks."$1" |wc -l
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}
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# Dirty hack to ensure that "getent hosts tasks.XXXX" will list us
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sleep 3
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## STARTING REDIS ##
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if [ "$1" = "redis-server" ]; then
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echo "[DEBUG] PREPARING to start redis-server..."
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# Check how many redis replicas are currently running...
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if [ "$(count_tasks redis)" -gt 1 ]; then
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# Other instances are running, we shall ask to one sentine who is master
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echo "[DEBUG] Already one redis (or more) instance running, we'll ask the master IP to a sentinel and set ourself as slave..."
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# TODO: sanity check : Manage the case where there's no sentinel ?
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# Wait for a sentinel to be alive
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until [ "$(redis-cli -h "$REDIS_SENTINEL_IP" -p "$REDIS_SENTINEL_PORT" ping)" = "PONG" ]; do
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echo "$REDIS_SENTINEL_IP is unavailable - sleeping"
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sleep 1
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done
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# Get current master IP
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master_info=$(redis-cli -h "$REDIS_SENTINEL_IP" -p "$REDIS_SENTINEL_PORT" sentinel get-master-addr-by-name "$REDIS_MASTER_NAME")
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# Ensure we have something from sentinel
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until [ "$master_info" ]; do
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echo "$REDIS_MASTER_NAME not found - sleeping"
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sleep 1
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master_info=$(redis-cli -h "$REDIS_SENTINEL_IP" -p "$REDIS_SENTINEL_PORT" sentinel get-master-addr-by-name "$REDIS_MASTER_NAME")
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done
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master_ip=$(echo $master_info | awk '{print $1}')
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master_port=$(echo $master_info | awk '{print $2}')
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echo "[DEBUG] STARTING redis as a SLAVE of $master_ip $master_port"
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redis-server --slaveof $master_ip $master_port
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else
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# Only one redis - So we may be master? - TODO: Add sanity checks ?
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# Like : Is there any sentinels ? What are they doing ?...
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echo "[DEBUG] No other redis are running.... Starting redis as MASTER !!"
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exec "$@"
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fi
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## STARTING SENTINEL ##
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elif [ "$1" = "redis-sentinel" ]; then
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echo "[DEBUG] PREPARING sentinel"
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# Update config with ENV
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sed -i "s/{{ SENTINEL_QUORUM }}/$SENTINEL_QUORUM/g" /usr/local/etc/redis/sentinel.conf
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sed -i "s/{{ SENTINEL_DOWN_AFTER }}/$SENTINEL_DOWN_AFTER/g" /usr/local/etc/redis/sentinel.conf
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sed -i "s/{{ SENTINEL_FAILOVER }}/$SENTINEL_FAILOVER/g" /usr/local/etc/redis/sentinel.conf
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sed -i "s/{{ REDIS_MASTER_NAME }}/$REDIS_MASTER_NAME/g" /usr/local/etc/redis/sentinel.conf
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# Check how many sentinels replicas are currently running...
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if [ "$(count_tasks redissentinel)" -gt 1 ]; then
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echo "[DEBUG] Already one (or more) sentinel instance running, we'll ask the master IP to a sentinel and set it as the master"
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# Fetch sentiten
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sentinel_ips=$(getent hosts tasks.redissentinel | awk '{print $1}');
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for ip in $sentinel_ips; do
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REDIS_IP=$(redis-cli -h "$ip" -p 26379 sentinel get-master-addr-by-name "$REDIS_MASTER_NAME" | head -1)
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echo "[DEBUG] According to sentinel at $ip - Master_info is : $REDIS_IP"
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if [ "$REDIS_IP" ]; then
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break
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fi
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done
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sed -i "s/{{ REDIS_IP }}/$REDIS_IP/g" /usr/local/etc/redis/sentinel.conf
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echo "[DEBUG] Starting sentinel with redismaster as $REDIS_IP"
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redis-server /usr/local/etc/redis/sentinel.conf --sentinel
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else
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# No other sentinels around.
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echo "[DEBUG] No other sentinel running...."
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# Is there redis instance running ?
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if [ "$(count_tasks redis)" -gt 1 ]; then
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# More than 1 redis running... Not so fun case to manage....
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echo "[DEBUG] More than 1 redis running - Giving up...."
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elif [ "$(count_tasks redis)" -eq 1 ]; then
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echo "[DEBUG] Only one redis is runnig. Let's say its a master!"
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REDIS_IP=$(getent hosts tasks.redis | awk '{print $1}');
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sed -i "s/{{ REDIS_IP }}/$REDIS_IP/g" /usr/local/etc/redis/sentinel.conf
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redis-server /usr/local/etc/redis/sentinel.conf --sentinel
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else
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echo "[DEBUG] No redis running... - Giving up...."
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fi;
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fi;
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fi;
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