[Nix-dev] restarting a mongodb

[Tomasz Kontusz]

I think you can add `systemd.services.mongodb.requires = 
["mongo.mount"]` to tell systemd to mount (and wait for) /mongo when 
starting MongoDB.

On 07/08/2015 07:13 AM, stewart mackenzie wrote:
> Hello all,
>
> So rebuilding our database server with this bit in our config:
>
> ```
>
>                      services = {
>                          mongodb = {
>                              enable = true;
>                              bind_ip = "0.0.0.0";
>                              dbpath = "/mongo/db";
>                          };
>                      };
>                      fileSystems."/mongo" = {
>                          device = "/dev/xvdb";
>                          fsType = "ext4";
>                          autoFormat = true;
>                      };
> ```
>
> resulted in this issue:
>
> ```
>
> starting the following units: cron.service, fetch-ec2-data.service,
> kmod-static-nodes.service, network-local-commands.service,
> network-setup.service, nix-daemon.service, nscd.service, ntpd.service,
> print-host-key.service, rngd.service, systemd-logind.service,
> systemd-modules-load.service, systemd-sysctl.service,
> systemd-tmpfiles-clean.timer, systemd-tmpfiles-setup-dev.service,
> systemd-udev-settle.service, systemd-udev-trigger.service,
> systemd-udevd.service, systemd-vconsole-setup.service
> the following new units were started: mongo-bak.mount, mongo.mount,
> postfix.service
> warning: the following units failed: mongodb.service
>
> ● mongodb.service - MongoDB server
>     Loaded: loaded
> (/nix/store/5kvf87w82nk9kfh5p2iamdq7gzc9nfr3-unit-mongodb.service/mongodb.service)
>     Active: failed (Result: exit-code) since Wed 2015-07-08 12:38:15
> HKT; 12ms ago
>    Process: 15082
> ExecStart=/nix/store/ifx5xm0m625gv003v1zsn15pr447zwmf-mongodb-2.6.5/bin/mongod
> --quiet --config
> /nix/store/18ahs474r1gbpkacy22rl6vy7q8jwxfq-mongodb.conf (code=exited,
> status=100)
>    Process: 15041
> ExecStartPre=/nix/store/sig4djkyinm552svg58ryzvs0apxjbf2-unit-script/bin/mongodb-pre-start
> (code=exited, status=0/SUCCESS)
>
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> mongod.27017[15137]: [initandlisten] warning caught exception
> (assertion src/mongo/db/dur_journal.cpp:362) in preallocateFiles,
> continuing
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> mongod.27017[15137]: [initandlisten] exception in initAndListen: 13516
> couldn't open file /mongo/db/journal/j._0 for writing errno:2 No such
> file or directory, terminating
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> mongod.27017[15137]: [initandlisten] dbexit:
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> mongod.27017[15137]: [initandlisten] shutdown: going to close
> listening sockets...
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> mongod.27017[15137]: [initandlisten] shutdown: going to flush
> diaglog...
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> mongod[15082]: ERROR: child process failed, exited with error number
> 100
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> systemd[1]: mongodb.service: control process exited, code=exited
> status=100
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> systemd[1]: Failed to start MongoDB server.
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> systemd[1]: Unit mongodb.service entered failed state.
> Jul 08 12:38:15 ip-172-30-0-78.ap-southeast-1.compute.internal
> systemd[1]: mongodb.service failed.
> warning: error(s) occured while switching to the new configuration
> ```
>
> It seems the mongo db directory didn't exist yet as it was probably
> still formatting.
>
> Please note the "autoFormat = true;" in the script.
>
> We ran the script immediately afterwards and it ran without failures.
>
> As this is the database (which we're deprecating for datomic) it's important.
> How do I avoid such errors in future?
>
> Thanks in advance
> Stewart
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