kafka需要大量内存，磁盘内存不足，kafka无法启动，默认启动为1G
如下查看剩余内存,如图free内存只有94M,kafka启动时不够用的

[root@mypc01 /]# free -h
              total        used        free      shared  buff/cache   available
Mem:           1.8G        1.6G         94M        1.5M        110M         75M
Swap:          2.0G        1.8G        183M

启动内存在kafka-server-start.sh脚本中有设置,如下

cat kafka-server-start.sh

if [ $# -lt 1 ];
then
        echo "USAGE: $0 [-daemon] server.properties [--override property=value]*"
        exit 1
fi
base_dir=$(dirname $0)

if [ "x$KAFKA_LOG4J_OPTS" = "x" ]; then
    export KAFKA_LOG4J_OPTS="-Dlog4j.configuration=file:$base_dir/../config/log4j.properties"
fi

if [ "x$KAFKA_HEAP_OPTS" = "x" ]; then
# Xmx后面是最大内存,Xms是最小内存
    export KAFKA_HEAP_OPTS="-Xmx1G -Xms1G"
fi

EXTRA_ARGS=${EXTRA_ARGS-'-name kafkaServer -loggc'}

COMMAND=$1
case $COMMAND in
  -daemon)
    EXTRA_ARGS="-daemon "$EXTRA_ARGS
    shift
    ;;
  *)
    ;;
esac

exec $base_dir/kafka-run-class.sh $EXTRA_ARGS kafka.Kafka "$@"

总结

• kafka启动闪退或者无法启动可以看下剩余内存