Quick script to grab one or more log files (even gzipped ones) from multiple hosts at once.

read_logs.sh

#!/usr/bin/env bash

hosts=(
    # list the hosts to grab the logs from
    host1.foo.com
    host2.foo.com
)

remote_files=(
    # list the log files to grab
    /var/log/nginx/error.log
    /var/log/nginx/error.log-20161027.gz
)

log_directory=${PWD}/logs/$(date +'%Y-%m-%d-%H-%M-%S')

mkdir -p {$log_directory}

for host in ${hosts[@]}; do
    mkdir -p $log_directory/$host
    for file in ${remote_files[@]}; do
        file=$(dirname $file)/$(basename $file .gz)
        gz_file=$file.gz
        ssh -t -o StrictHostKeyChecking=no $host "(sudo [ -f $gz_file ] && sudo gunzip $gz_file || true) && sudo cat $file 2>&1" >> $log_directory/$host/$(basename $file)
    done
done

echo "Complete.\n\nLogs saved in: $log_directory"