A reboot can start your streaming software again, but only if EC2, the operating system and OBS are each configured for that job. You also need to verify YouTube separately, because restarting OBS does not by itself prove that the same live session has resumed.
The reliable way to approach this is in layers. First make the instance run the intended startup action after boot, then make OBS open in the correct user session, then tell OBS to begin streaming, and finally check the startup logs and YouTube Live Control Room.
What reboot recovery can and cannot ensure
There are three different events that are often described as “the stream restarting”. They are not interchangeable:
- Amazon EC2 starts the instance and the operating system completes its boot process.
- A startup mechanism launches OBS with the expected profile, scene and stream settings.
- OBS connects to YouTube and YouTube shows an active live broadcast.
A successful first event does not guarantee the second. A successful second event does not guarantee the third. For example, an EC2 user-data task might run as root, while the OBS profile and desktop session belong to another Linux user. On Windows, a task launched as a system process may not have access to the interactive desktop that OBS expects.
AWS documents that Linux user-data scripts and cloud-init directives run only during the initial launch by default. Subsequent-boot behaviour must be configured separately. Windows behaviour depends on the launch agent installed in the AMI and on its persistence settings. Start by identifying that environment rather than copying a Windows setting into every EC2 instance.
OBS documents the --startstreaming launch parameter. That parameter tells OBS what to do when it opens; it is not an EC2 reboot scheduler. It does not establish that the instance completed boot, that the correct profile loaded, that the network was ready, or that YouTube accepted the connection.
The same distinction matters if you are using a looping file, a devotional playlist or a local news sequence. A continuous YouTube stream from a folder of videos may have its own media and playlist checks, but those checks happen after the encoder has launched.
Map the recovery layers before changing settings
Write down the intended path in plain language before editing user data or scheduled tasks:
| Layer | Question to answer | Evidence to check |
|---|---|---|
| EC2 and launch agent | What runs after the instance boots, and does it run on every boot? | AWS user-data or launch-agent configuration and its log |
| Operating system | Which account, desktop session and environment run the command? | Process owner, working directory and session availability |
| OBS | Does OBS open the intended profile and start streaming? | OBS window, log and streaming status |
| YouTube | Is the live control room showing the expected active broadcast? | Current YouTube status, preview and health indicators |
This separation prevents a common troubleshooting mistake. If OBS is missing after a reboot, changing YouTube settings will not repair the startup task. If OBS is open but idle, changing EC2 persistence will not add the --startstreaming instruction. If OBS reports that it is streaming but YouTube does not show the expected broadcast, investigate the YouTube connection and current live-event behaviour rather than assuming the session continued.
Keep the stream key out of user-data scripts, screenshots and public logs. Treat it as a credential. If you place a command in a startup file, use the OBS configuration already associated with the intended account where possible, and restrict access to the file containing any sensitive value.
Before automating recovery, confirm what should play. A static ambience video, a playlist and an OBS scene collection can fail in different ways. If your source is a long video, it is also useful to understand the data use of a 24/7 YouTube stream, because a restarted encoder will resume sending data even if the content itself is not behaving as expected.
Check EC2 and operating-system startup behaviour
The first task is to find out which mechanism is responsible for recurring execution. AWS user data is not a universal “run this on every reboot” switch. On Linux, the default first-boot behaviour is documented in the Amazon EC2 user-data documentation. AWS also describes recurring execution and launch-agent differences in its user-data troubleshooting guidance.
On Linux, inspect the cloud-init configuration and the instance’s normal service-start behaviour. A script that ran when the instance was first created may not run again after a normal reboot. If you need recurring execution, configure the relevant subsequent-boot behaviour or use an operating-system service designed to start the encoder at boot. This article does not assume a particular Linux distribution or provide a service-unit recipe, because the correct account, display session and package paths differ between installations.
On Windows, identify whether the AMI uses EC2Launch v2, EC2Launch v1 or the older EC2Config service. The configuration syntax is not interchangeable. AWS documents these launch-agent differences, and the installed agent should determine which setting you use.
For EC2Launch v2 YAML user data, AWS documents a task frequency of always. For XML user data, recurring execution can use the following persistence setting:
<persist>true</persist>
For EC2Launch v1, AWS documents the -SchedulePerBoot option. Do not add all three forms to the same configuration in the hope that one will work. First establish the installed agent, then follow the syntax for that agent and check its output after a reboot.
Windows user-data execution can also run under different accounts depending on the launch-agent and password-generation conditions. That matters for OBS. An OBS installation, profile, scene collection or desktop capture source available to an interactive administrator may not be available to a system process. A startup task that technically runs can therefore open the wrong profile, fail to display a window or lack access to the required session.
Record these details before editing anything:
- operating system and image name
- launch-agent version or service
- account that should own OBS
- OBS executable path
- profile and scene collection to use
- working directory required by the launch method
- startup log location
- how you will confirm the YouTube broadcast
This inventory is more useful than a single copy-and-paste command. It also makes it easier to distinguish a change in the EC2 layer from a change in OBS.
Configure recurring startup on Linux
Linux user-data scripts execute as root and do not accept interactive input. That makes them suitable for non-interactive boot work, but it also creates a session problem for desktop applications such as OBS. If OBS is installed for a desktop user, launching it directly from a root-only boot script may not reproduce the environment in which you normally open OBS.
Begin by confirming whether your current user-data or cloud-init configuration is first-boot only. The default behaviour is not enough for recurring recovery. AWS’s documentation points to separate configuration for subsequent restarts. Follow the current guidance for your distribution and cloud-init version rather than assuming that a script placed in user data will run after every reboot.
Then decide which account and session should launch OBS. For a graphical OBS setup, that normally means the same user who owns the OBS configuration and has access to the display session. If the instance is intended to run without an interactive desktop, consider whether OBS is the right encoder for the job and whether its sources require a graphical session. A command that works from an open terminal is not proof that it will work during boot.
Use a small wrapper or startup entry that records its own progress, checks that the expected executable exists and then launches OBS with the intended working directory. Avoid putting the YouTube stream key directly in that wrapper. The wrapper should fail clearly if the profile or executable is missing, rather than appearing to start successfully while doing nothing.
After configuring recurring startup, inspect the AWS-supported cloud-init output location:
/var/log/cloud-init-output.log
Look for the time of the reboot and the command or task that should have launched OBS. If there is no corresponding entry, the problem is in the cloud-init or operating-system startup layer. If the entry exists but OBS is not visible, investigate the user, display session, executable path and permissions. If OBS opens but does not stream, move to the OBS layer instead of repeatedly editing cloud-init.
A restart test should also include an ordinary login and a check of the process owner. Do not assume that a process with an OBS name is using the profile you intended. The profile, scene collection and media source should be visible in OBS before you treat the encoder launch as successful.
Configure recurring startup on Windows
Windows EC2 startup depends on the launch agent in the AMI. Find out whether the instance uses EC2Launch v2, EC2Launch v1 or EC2Config before editing user data. AWS’s documented recurring options differ between these agents.
With EC2Launch v2 YAML, set the relevant task frequency to always when the task is intended to run on every boot. With XML user data, use the documented <persist>true</persist> setting for recurring execution. With EC2Launch v1, use its documented -SchedulePerBoot mechanism. These are examples of agent-specific controls, not three settings that should be combined.
Next, match the startup account to OBS. A process launched by a service or system account may not see the interactive desktop, user profile or scene assets used by your normal OBS login. If the stream depends on a display capture, browser source or other desktop-bound source, this distinction is particularly important. Test the account and session deliberately rather than treating “the command ran” as sufficient evidence.
For Windows automated or scheduled OBS launches, OBS documents that the working directory should be set to the folder containing obs64.exe. This avoids a class of failures where the executable path is correct but relative files, configuration access or the launch environment are not. Use the actual installation path on your instance rather than assuming every AMI uses the same folder.
A conceptual launch entry will usually contain three separate pieces:
working directory: the folder containing obs64.exe
program: the full path to obs64.exe
argument: --startstreaming
The launch agent or scheduled-task interface determines how those pieces are expressed. Do not paste this block as a complete EC2Launch configuration. Adapt it to the agent and startup method installed on the instance.
After rebooting, check the appropriate AWS log. EC2Launch v2 records agent activity in:
C:\ProgramData\Amazon\EC2Launch\log\agent.log
EC2Launch v1 records user-data execution in:
C:\ProgramData\Amazon\EC2-Windows\Launch\Log\UserdataExecution.log
If the log shows no recurring task, correct the launch-agent configuration. If it shows the task ran but OBS is absent, check the account, desktop session, working directory and executable path. If OBS is open but idle, inspect the OBS launch arguments and profile.
Launch OBS after boot
The startup mechanism and the OBS command should be treated as two separate checkpoints. First prove that the operating system runs the task. Then prove that the task opens OBS in the intended environment.
OBS lists --startstreaming among its launch parameters in the OBS Project launch-parameters documentation. The parameter is useful because it places the instruction to begin streaming alongside the instruction to open OBS. It does not replace the EC2 recurring-start configuration.
Use the full executable path when the startup environment may not have the same PATH as your interactive shell. Use the expected user profile, and make the working directory explicit on Windows as OBS recommends. On Linux, confirm that the process can access the display session and the files used by the selected scene. If you use a media source, check its path after reboot rather than relying on a path that only exists in your normal login environment.
A good first test is to launch OBS manually with the intended profile and argument while logged into the target account. Confirm that the correct scenes, media and output settings appear. Then use the same executable, arguments and account in the boot task. This removes one variable before you test the reboot path.
Do not add automatic retry loops until the basic launch works. A retry can hide a wrong path or an account problem and can create multiple OBS processes. Start with one clear launch attempt, useful logging and a controlled manual check. Once the path is correct, decide whether your operating-system startup mechanism needs its own retry behaviour.
If the stream source is a playlist, inspect the content after OBS opens. For example, a playlist may repeat one item because of an OBS source setting rather than because the EC2 recovery failed. The guide to fixing a YouTube 24/7 playlist that repeats the same video covers a different failure layer, but the principle is the same: identify whether the fault is in startup, encoding or content selection.
Set OBS to begin streaming
Opening OBS is not the same as streaming. Without the start-streaming instruction, OBS may wait at its normal idle screen after boot. With --startstreaming, OBS receives the documented instruction to begin streaming when it launches.
Before enabling the boot task, confirm the OBS output settings manually. Check the selected service, stream configuration, scene and source. Avoid exposing the stream key while doing this. If you need to inspect technical behaviour after a connection starts, compare what OBS reports with YouTube’s current live information.
An encoder can also be active while sending the wrong source or an unusable output. A simple recovery checklist should therefore include:
- OBS opens under the intended account.
- The expected profile and scene collection load.
- The source is visible and playing.
- OBS shows that streaming has begun.
- The output is reaching the intended YouTube channel.
- YouTube shows the expected live status.
If you use FFmpeg elsewhere in your workflow, do not assume that OBS and FFmpeg expose the same failure signals. For OBS-based recovery, start with OBS’s own state and logs. For a separate encoder, use the diagnostics appropriate to that encoder. A bitrate and dropped-frames check on YouTube Live can help with output diagnosis, but it does not confirm that your EC2 startup task ran.
Most importantly, do not describe --startstreaming as proof that YouTube will preserve the same live event. The available AWS and OBS documentation supports the startup and launch behaviour. It does not establish YouTube’s reconnect window, persistent-stream behaviour or session-resumption rules for this workflow. Check current official YouTube Live guidance before relying on a particular reconnection outcome.
Test recovery and verify YouTube status
The research for this setup does not include a tested instance or a verified end-to-end live stream. Treat your own reboot test as a controlled exercise, not as evidence that every future interruption will behave identically.
Start with a maintenance window and note the current state. Record whether OBS is streaming, which profile is selected and what YouTube shows. Then reboot the EC2 instance using the normal method you expect to use in operation. Do not change several settings during the same test.
After the instance returns, check the layers in order:
- Confirm that EC2 reports the instance as running and that you can reach the operating system.
- Open the AWS startup log for the relevant launch agent or cloud-init process.
- Confirm that the recurring task ran at the expected time.
- Check the OBS process owner, profile, scene and source.
- Confirm that OBS reports an active streaming connection.
- Open YouTube Live Control Room and verify the current broadcast status.
On Linux, begin with /var/log/cloud-init-output.log. On Windows, use the EC2Launch v2 agent.log or the EC2Launch v1 UserdataExecution.log, depending on the installed agent. These logs can tell you whether the AWS startup layer ran, but they cannot prove that YouTube accepted the stream or that the previous live session continued.
If the task did not run, fix persistence or scheduling. If the task ran but OBS did not open, fix the executable path, working directory, account or session. If OBS opened without streaming, fix the launch argument and OBS configuration. If OBS reports streaming but YouTube shows an unexpected state, stop assuming that the reboot automation is the remaining problem and investigate the live-session behaviour using current YouTube documentation.
Repeat the test after changing only the layer you are investigating. Keep a short record of the launch-agent version, account, command, log entry and YouTube result. That record is especially valuable when a reboot happens overnight and you need to distinguish a machine restart from a channel or connection issue.
For some operators, the main cost is not writing the startup command but maintaining the desktop environment, profile and recovery checks on a cloud instance. If you want the uploaded file and YouTube connection handled without keeping your own EC2 and OBS boot path alive, StreamNeo removes that specific reboot-and-login task: you upload the video, add your YouTube stream key and let the channel run without your computer switched on.
Before committing, compare the operating options on the pricing page. When the file and channel are ready, start free — 24-hour trial, no card.
FAQ
Does EC2 user data run after every reboot?
Not by default in every case. AWS documents first-boot behaviour for Linux user-data scripts and cloud-init directives, while Windows recurrence depends on the installed launch agent and its configuration. Confirm the relevant agent and inspect its startup output before relying on recurring execution.
Is --startstreaming an EC2 reboot setting?
No. It is an OBS launch parameter that tells OBS to begin streaming when it opens. EC2 or the operating system still needs a separate recurring startup mechanism to launch OBS after boot.
Which Windows persistence setting should I use?
That depends on the launch agent in the AMI. AWS documents always for the relevant EC2Launch v2 YAML task, <persist>true</persist> for XML user data and -SchedulePerBoot for EC2Launch v1. Identify the installed agent before applying one of these options.
Will restarting OBS resume the same YouTube live session?
The AWS and OBS sources used for this setup do not establish that outcome. Verify the current YouTube Live documentation and check the Live Control Room after a controlled reboot rather than assuming that an OBS restart preserves the previous live event.