Fixing race condition on private key backup how-to
Signed-off-by: Diogo Monica <diogo@docker.com> Upstream-commit: fbb268c12ab12fa282f11eabdedf7fdee3d24b4a Component: engine
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@ -45,8 +45,7 @@ The Docker client stores the keys in the `~/.docker/trust/private` directory.
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Before backing them up, you should `tar` them into an archive:
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```bash
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$ tar -zcvf private_keys_backup.tar.gz ~/.docker/trust/private
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$ chmod 600 private_keys_backup.tar.gz
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$ umask 077; tar -zcvf private_keys_backup.tar.gz ~/.docker/trust/private; umask 022
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```
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## Lost keys
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