Mongodb on Kubernetes exceed memory limit - Available memory is less than system memory

I tried to run Mongodb on Kubernetes. However it always got Evicted every 1-2 minutes. I tried to run the image in docker and worked fine. Do I need to make special configuration?

deployment file

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mongodb1
  namespace: xxxxx
  labels:
    app: mongodb1
    env: dev1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mongodb1
      env: dev1
  template:
    metadata:
      labels:
        app: mongodb1
        env: dev1
    spec:
      containers:
      - name: mongodb1
        image: xxxx/mongo:1.0
        ports:
        - containerPort: 27017
        env:
        - name: TZ
          value: Asis/Bangkok
        - name: MONGO_INITDB_DATABASE
          value: blockchaindb
        tty: true
        stdin: true
        resources:
          limits:
            cpu: 500m
            memory: 2Gi
          requests:
            cpu: 500m
            memory: 2Gi
      imagePullSecrets:
      - name: xxxx 

I tried to use the config file and rename the image name. So, I created a Dockerfile. Here is my DockerFile.

FROM mongo:latest

MAINTAINER TEST

COPY ./mongo-init.js /docker-entrypoint-initdb.d/mongo-init.js
COPY ./mongod.conf /etc/mongod.conf
RUN mkdir /var/lib/mongodb


RUN mongod --fork --logpath /var/log/mongodb.log --dbpath /var/lib/mongodb \
    && CREATE_FILES=/docker-entrypoint-initdb.d/* \
    && for f in $CREATE_FILES; do mongo 127.0.0.1:27017 $f; done \
    && mongod --dbpath /var/lib/mongodb --shutdown \
    && chown -R mongodb /var/lib/mongodb

CMD mongod --config /etc/mongod.conf

I set up wiredTigerCacheSize to 512M, but the logs still show systemMemorySize 60G.

cache_size=512M

{"t":{"$date":"2021-02-18T02:25:08.651+00:00"},"s":"I",  "c":"STORAGE",  "id":22315,   "ctx":"initandlisten","msg":"Opening WiredTiger","attr":{"config":"create,cache_size=512M,session_max=33000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000,close_scan_interval=10,close_handle_minimum=250),statistics_log=(wait=0),verbose=[recovery_progress,checkpoint_progress,compact_progress],"}}

Logs "systemMemSizeMB":64380

{"t":{"$date":"2021-02-18T02:25:08.648+00:00"},"s":"W",  "c":"CONTROL",  "id":20720,   "ctx":"initandlisten","msg":"Available memory is less than system memory","attr":{"availableMemSizeMB":2048,"systemMemSizeMB":64380}}