Clean up aws-cni-support.sh and update the documentation.

* Standardized on .out for output
* Create log directory if it doesn't exist
* Stop referencing `localhost:10255`
* Consistent parameter substitution

Fixes #285 and #311

(cherry picked from commit ddbb065)

docs/cni-proposal.md

@@ -189,7 +189,7 @@ curl http://169.254.169.254/latest/meta-data/network/interfaces/macs/0a:da:9d:51
 Whenever L-IPAM daemon restarts (e.g. for upgrade reason), it also queries local Kubelet introspection service to get current running Pods information such as Pod Name, Pod Namespace and Pod IP address.
 
 ```
-curl --stderr /dev/null http://localhost:10255/pods 
+kubectl get --raw=/api/v1/pods 
 ```
 With the information from these 2 sources, L-IPAM can build a warm-pool that contains all available secondary IP addresses on the instance.
 

scripts/aws-cni-support.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"). You may
@@ -17,57 +17,67 @@
 # Set language to C to make sorting consistent among different environments.
 export LANG=C
 
-set -e
+set -euo pipefail
 LOG_DIR="/var/log/aws-routed-eni"
+mkdir -p ${LOG_DIR}
 
 # collecting L-IPAMD introspection data
-curl http://localhost:61678/v1/enis         > ${LOG_DIR}/eni.output
-curl http://localhost:61678/v1/pods         > ${LOG_DIR}/pod.output
-curl http://localhost:61678/v1/networkutils-env-settings > ${LOG_DIR}/networkutils-env.output
-curl http://localhost:61678/v1/ipamd-env-settings > ${LOG_DIR}/ipamd-env.output
-curl http://localhost:61678/v1/eni-configs  > ${LOG_DIR}/eni-configs.output
-
-# metrics TODO not able to use LOG_DIR
-curl http://localhost:61678/metrics 2>&1 > /var/log/aws-routed-eni/metrics.output
-
-# collecting kubelet introspection data
-curl http://localhost:10255/pods  > ${LOG_DIR}/kubelet.output
+curl http://localhost:61678/v1/enis         > ${LOG_DIR}/eni.out
+curl http://localhost:61678/v1/pods         > ${LOG_DIR}/pod.out
+curl http://localhost:61678/v1/networkutils-env-settings > ${LOG_DIR}/networkutils-env.out
+curl http://localhost:61678/v1/ipamd-env-settings > ${LOG_DIR}/ipamd-env.out
+curl http://localhost:61678/v1/eni-configs  > ${LOG_DIR}/eni-configs.out
+
+# metrics
+curl http://localhost:61678/metrics 2>&1 > ${LOG_DIR}/metrics.out
+
+# Collecting kubelet introspection data
+if [[ -f /etc/systemd/system/kubelet.service ]]; then
+    KUBECONFIG=${KUBECONFIG:-`grep kubeconfig /etc/systemd/system/kubelet.service | awk '{print $2}'`}
+elif [[ -f /etc/eksctl/kubeconfig.yaml ]]; then
+    KUBECONFIG=${KUBECONFIG:-/etc/eksctl/kubeconfig.yaml}
+fi
+if [[ -z "KUBECONFIG" ]]; then
+    echo "======== Unable to find KUBECONFIG ========="
+else
+    command -v kubectl > /dev/null && kubectl get --kubeconfig=${KUBECONFIG} --raw=/api/v1/pods > ${LOG_DIR}/kubelet.out
+fi
 
 # ifconfig
-ifconfig > ${LOG_DIR}/ifconig.output
+ifconfig > ${LOG_DIR}/ifconfig.out
 
 # ip rule show
-ip rule show > ${LOG_DIR}/iprule.output
+ip rule show > ${LOG_DIR}/iprule.out
 
 # iptables-save
-iptables-save > $LOG_DIR/iptables-save.out
+iptables-save > ${LOG_DIR}/iptables-save.out
 
 # iptables -nvL
-iptables -nvL > $LOG_DIR/iptables.out
+iptables -nvL > ${LOG_DIR}/iptables.out
 
 # iptables -nvL -t nat
-iptables -nvL -t nat > $LOG_DIR/iptables-nat.out
+iptables -nvL -t nat > ${LOG_DIR}/iptables-nat.out
 
 # iptables -nvL -t mangle
-iptables -nvL -t mangle > $LOG_DIR/iptables-mangle.out
+iptables -nvL -t mangle > ${LOG_DIR}/iptables-mangle.out
 
 # dump cni config
-mkdir -p $LOG_DIR/cni
-cp /etc/cni/net.d/* $LOG_DIR/cni
+mkdir -p ${LOG_DIR}/cni
+cp /etc/cni/net.d/* ${LOG_DIR}/cni
 
 # collect kubelet log
-cp /var/log/messages $LOG_DIR/
+cp /var/log/messages ${LOG_DIR}/
 
 # dump out route table
-ROUTE_OUTPUT="route.output"
-echo "=============================================" >> ${LOG_DIR}/${ROUTE_OUTPUT}
-echo "ip route show table all" >> $LOG_DIR/$ROUTE_OUTPUT
-ip route show table all >> $LOG_DIR/$ROUTE_OUTPUT
+ROUTE_OUTPUT=${LOG_DIR}/"route.out"
+echo "=============================================" >> ${ROUTE_OUTPUT}
+echo "ip route show table all" >> ${ROUTE_OUTPUT}
+ip route show table all >> ${ROUTE_OUTPUT}
 
 # dump relevant sysctls
 echo "================== sysctls ==================" > ${LOG_DIR}/sysctls.out
 for f in /proc/sys/net/ipv4/conf/{all,default,eth0}/rp_filter; do
-  echo "$f = $(cat $f)" >> ${LOG_DIR}/sysctls.out
+  echo "$f = $(cat ${f})" >> ${LOG_DIR}/sysctls.out
 done
 
-tar -cvzf $LOG_DIR/aws-cni-support.tar.gz ${LOG_DIR}/
+tar -cvzf ${LOG_DIR}/aws-cni-support.tar.gz ${LOG_DIR}/