Usage:

Install the Helm chart: https://github.com/peterfromthehill/tproxy-helm

And use a initContainer and a sidecar to talk to the tproxy.

Example:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
      - name: socat
        image: nicolaka/netshoot
        command:
        - sh
        - -c
        - echo -e '3128\n3129\n3130\n8080\n8443' | while read port; do (socat -d -d -d TCP4-LISTEN:$port,fork,reuseaddr TCP4:tproxy:$port &); done && tail -F /dev/null
      - name: hpi  
        image: app
        securityContext:
          capabilities:
            add:
            - NET_ADMIN
          privileged: true  
        volumeMounts: 
          - name: ssl
            mountPath: /etc/ssl/
          - name: ca-volume
            mountPath: /usr/local/share/ca-certificates            
      initContainers:
      - name: init-networking
        image: nicolaka/netshoot
        securityContext:
          capabilities:
            add:
            - NET_ADMIN
          privileged: true
        command:
        - sh
        - -xc
        - iptables -t nat -I OUTPUT -p tcp --dport 443 -j REDIRECT --to-port 8443
      - name: sslinit
        image: app
        command:
          - sh
          - -xc
          - update-ca-certificates && cp -r /etc/ssl/* /data/
        volumeMounts:
          - name: ca-volume
            mountPath: /usr/local/share/ca-certificates
          - name: ssl
            mountPath: /data
      volumes:
        - name: ssl
          emptyDir: {}
        - name: ca-volume
          configMap:
            name: ca