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RabbitMQ Operations
About me
About me
• RabbitMQ staff engineer at Pivotal
About me
• RabbitMQ staff engineer at Pivotal
• @michaelklishin just about everywhere
RabbitMQ Operations
About this talk
About this talk
• Brain dump from years of answering questions
About this talk
• Brain dump from years of answering questions
• Focusses on the most recent release (3.5.6)
RabbitMQ Operations
Provisioning
Provisioning
• Be aware of mirrors: GitHub, Bintray, …
Provisioning
• Be aware of mirrors: GitHub, Bintray, …
• Looking into community-hosted mirrors
Provisioning
• Be aware of mirrors: GitHub, Bintray, …
• Looking into community-hosted mirrors
• Use packages + Chef/Puppet/…
RabbitMQ Operations
OS resources
OS resources
• Modern Linux defaults are absolutely inadequate
for servers
ulimit -n default: 1024
RabbitMQ Operations
Set ulimit -n and fs.file-max to 500K
and forget about it
TCP keepalive timeout:
from 11 minutes to over 2
hours by default
net.ipv4.tcp_keepalive_time = 6
net.ipv4.tcp_keepalive_intvl = 3
net.ipv4.tcp_keepalive_probes = 3
enable client heartbeats, e.g. with an
interval of 6-12 seconds
OS resources
• Modern Linux defaults are absolutely inadequate
for servers
• Tuning for throughput vs. high number of
concurrent connections
Throughput: larger TCP buffers
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
rabbit.hipe_compile = true
(only on Erlang 17.x or 18.x)
Concurrent connections: smaller TCP
buffers, low tcp_fin_timeout,
tcp_tw_reuse = 1, …
rabbit.tcp_listen_options.sndbuf
rabbit.tcp_listen_options.recbuf
rabbit.tcp_listen_options.backlog
Reduce per connection
RAM use by 10x
rabbit.tcp_listen_options.sndbuf = 16384
rabbit.tcp_listen_options.recbuf = 16384
RabbitMQ Operations
Reduce per connection
RAM use by 10x
Throughput drops by a comparable amount
net.ipv4.tcp_fin_timeout = 5
net.ipv4.tcp_tw_reuse = 1
Careful with tcp_tw_reuse
behind NAT*
* http://vincent.bernat.im/en/blog/2014-tcp-time-wait-state-linux.html
net.core.somaxconn = 4096
http://www.rabbitmq.com/networking.html
RabbitMQ Operations
Disk space
Disk space
• Pay attention to what partition /var/lib ends up on
Disk space
• Pay attention to what partition /var/lib ends up on
• Transient messages can be paged to disk
Disk space
• Pay attention to what partition /var/lib ends up on
• Transient messages can be paged to disk
• RabbitMQ’s disk monitor isn’t supported on all
platforms
RabbitMQ Operations
RAM usage
RAM usage
• rabbit.vm_memory_high_watermark
RAM usage
• rabbit.vm_memory_high_watermark
• rabbit.vm_memory_high_watermark_paging_ratio
rabbitmqctl status
rabbitmqctl report
RAM usage
• rabbit.vm_memory_high_watermark
• rabbit.vm_memory_high_watermark_paging_ratio
• Significant paging efficiency improvements in
3.5.5-3.5.6
RAM usage
• rabbit.vm_memory_high_watermark
• rabbit.vm_memory_high_watermark_paging_ratio
• Significant paging efficiency improvements in
3.5.5-3.5.6
• Disable rabbit.fhc_read_buffering (3.5.6+)
rabbitmqctl eval
‘file_handle_cache:clear_read_cache().’
recon
Ability to set VM RAM watermark as absolute
value is coming in 3.6
RabbitMQ Operations
Stats collector falls behind
Stats collector falls behind
• Management DB stats collector can get
overwhelmed
Stats collector falls behind
• Management DB stats collector can get
overwhelmed
• Key symptom: disproportionally higher RAM use
on the node that hosts management DB
rabbitmqctl eval 'P = whereis(rabbit_mgmt_db), erlang:process_info(P).'
[{registered_name,rabbit_mgmt_db},
{current_function,{erlang,hibernate,3}},
{initial_call,{proc_lib,init_p,5}},
{status,waiting},
{message_queue_len,0},
{messages,[]},
{links,[<5477.358.0>]},
{dictionary,[{'$ancestors',[<5477.358.0>,rabbit_mgmt_sup,rabbit_mgmt_sup_sup,
<5477.338.0>]},
{'$initial_call',{gen,init_it,7}}]},
{trap_exit,false},
{error_handler,error_handler},
{priority,high},
{group_leader,<5477.337.0>},
{total_heap_size,167},
{heap_size,167},
{stack_size,0},
{reductions,318},
{garbage_collection,[{min_bin_vheap_size,46422},
{min_heap_size,233},
{fullsweep_after,65535},
{minor_gcs,0}]},
{suspending,[]}]
rabbit.collect_statistics_interval = 30000
rabbitmq_management.rates_mode = none
rabbitmqctl eval 'P = whereis(rabbit_mgmt_db), erlang:exit(P, please_crash).'
Parallel stats collector is coming in 3.7
RabbitMQ Operations
Cluster formation
Cluster formation
• Node restart order dependency
Cluster formation
• Node restart order dependency
• github.com/rabbitmq/rabbitmq-clusterer
Cluster formation
• Node restart order dependency
• github.com/rabbitmq/rabbitmq-clusterer
• github.com/aweber/rabbitmq-autocluster
RabbitMQ Operations
Backups
How do I back up?
• cp $RABBITMQ_MNESIA_DIR + tar
How do I back up?
• cp $RABBITMQ_MNESIA_DIR + tar
• Replicate everything off-site with exchange
federation + set message TTL via a policy
RabbitMQ Operations
Hostname changes
rabbitmqctl rename_cluster_node [old name] [new name]
RabbitMQ Operations
Network partition handling
Network partition handling
• When in doubt, use “autoheal”
Network partition handling
• When in doubt, use “autoheal”
• “Merge” is coming but has very real downsides,
too
RabbitMQ Operations
Misc
Misc
• Don’t use default vhost and/or credentials
Misc
• Don’t use default vhost and/or credentials
• Don’t use 32-bit Erlang
Misc
• Don’t use default vhost and/or credentials
• Don’t use 32-bit Erlang
• Use reasonably up-to-date releases
Misc
• Don’t use default vhost and/or credentials
• Don’t use 32-bit Erlang
• Use reasonably up-to-date releases
• Participate in rabbitmq-users
Misc
• OCF resource template from Fuel (by Mirantis)
Misc
• OCF resource template from Fuel (by Mirantis)
• Use TLS
RabbitMQ Operations
Coming in 3.6
Coming in 3.6
• In process file buffering disabled by default
Coming in 3.6
• In process file buffering disabled by default
• Queue master to node distribution strategies
Coming in 3.6
• In process file buffering disabled by default
• Queue master to node distribution strategies
• SHA-256 (or 512) for password hashing
Coming in 3.6
• In process file buffering disabled by default
• Queue master to node distribution strategies
• SHA-256 (or 512) for password hashing
• More responsive management UI with
pagination
Coming in 3.6
• In process file buffering disabled by default
• Queue master to node distribution strategies
• SHA-256 (or 512) for password hashing
• More responsive management UI with
pagination
• Streaming rabbitmqctl
Coming past 3.6
Coming past 3.6
• Pluggable cluster formation (à la ElasticSearch)
Coming past 3.6
• Pluggable cluster formation (à la ElasticSearch)
• On disk data recovery tools
Coming past 3.6
• Pluggable cluster formation (à la ElasticSearch)
• On disk data recovery tools
• Better CLI tools
Coming past 3.6
• Pluggable cluster formation (à la ElasticSearch)
• On disk data recovery tools
• Better CLI tools
• Easier off-site replication
Coming past 3.6
• Pluggable cluster formation (à la ElasticSearch)
• On disk data recovery tools
• Better CLI tools
• Easier off-site replication
• “Merge” partition handling strategy (no earlier
than 3.8)
RabbitMQ Operations
Thank you
Thank you
• @michaelklishin
• github.com/michaelklishin
• rabbitmq-users
• Our team is hiring!

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