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Quick n' dirty utility to compare sysctls between two machines.
#!/usr/bin/env ruby
#
# This utility compares `sysctl -a` on two given boxes
#
puts "Usage: #{$PROGRAM_NAME} hostname other_hostname" and exit unless ARGV.length == 2
SYSCTLS = {}
def sysctls(hostname)
raw = `ssh #{hostname} 'sysctl -a'`
Hash.new.tap do |packages|
raw.split("\n").each do |line|
name, value = *line.split('=').collect(&:strip)
SYSCTLS[name] ||= []
SYSCTLS[name] << [hostname, value]
end
end
end
ARGV.each do |hostname|
sysctls hostname
end
exclusives = {}
shared = {}
SYSCTLS.each do |name, record|
if record.length == 1
hostname = record.first.first
exclusives[hostname] ||= []
exclusives[hostname] << name
elsif record.length == 2
first_host_sysctl_value = record.first.last
second_host_sysctl_value = record.last.last
if first_host_sysctl_value != second_host_sysctl_value
shared[name] = record
end
else
puts "MULTIPLE values for sysctl #{name}, you figure it out: #{record}"
end
end
exclusives.each do |hostname, sysctls|
sysctls.each do |sysctl|
puts "ONLY #{hostname} has sysctl #{sysctl}"
end
end
shared.each do |name, information|
first_host_info = information.first
second_host_info = information.last
first_host = first_host_info.first
second_host = second_host_info.first
first_host_sysctl_value = first_host_info.last
second_host_sysctl_value = second_host_info.last
if first_host_sysctl_value != second_host_sysctl_value
differences = {first_host => first_host_sysctl_value, second_host => second_host_sysctl_value }
puts "BOTH #{name} #{differences}"
end
end
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