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Added section to FAQ about environment variables, which allow to control location of SSL root certificate as well as DNS resolver used. see also comment in #683
171 lines
6.4 KiB
Markdown
171 lines
6.4 KiB
Markdown
---
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title: "FAQ"
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description: "Rclone Frequently Asked Questions"
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date: "2015-08-27"
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---
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Frequently Asked Questions
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--------------------------
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### Do all cloud storage systems support all rclone commands ###
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Yes they do. All the rclone commands (eg `sync`, `copy` etc) will
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work on all the remote storage systems.
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### Can I copy the config from one machine to another ###
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Sure! Rclone stores all of its config in a single file. If you want
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to find this file, the simplest way is to run `rclone -h` and look at
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the help for the `--config` flag which will tell you where it is.
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See the [remote setup docs](/remote_setup/) for more info.
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### How do I configure rclone on a remote / headless box with no browser? ###
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This has now been documented in its own [remote setup page](/remote_setup/).
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### Can rclone sync directly from drive to s3 ###
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Rclone can sync between two remote cloud storage systems just fine.
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Note that it effectively downloads the file and uploads it again, so
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the node running rclone would need to have lots of bandwidth.
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The syncs would be incremental (on a file by file basis).
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Eg
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rclone sync drive:Folder s3:bucket
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### Using rclone from multiple locations at the same time ###
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You can use rclone from multiple places at the same time if you choose
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different subdirectory for the output, eg
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```
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Server A> rclone sync /tmp/whatever remote:ServerA
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Server B> rclone sync /tmp/whatever remote:ServerB
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```
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If you sync to the same directory then you should use rclone copy
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otherwise the two rclones may delete each others files, eg
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```
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Server A> rclone copy /tmp/whatever remote:Backup
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Server B> rclone copy /tmp/whatever remote:Backup
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```
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The file names you upload from Server A and Server B should be
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different in this case, otherwise some file systems (eg Drive) may
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make duplicates.
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### Why doesn't rclone support partial transfers / binary diffs like rsync? ###
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Rclone stores each file you transfer as a native object on the remote
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cloud storage system. This means that you can see the files you
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upload as expected using alternative access methods (eg using the
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Google Drive web interface). There is a 1:1 mapping between files on
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your hard disk and objects created in the cloud storage system.
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Cloud storage systems (at least none I've come across yet) don't
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support partially uploading an object. You can't take an existing
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object, and change some bytes in the middle of it.
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It would be possible to make a sync system which stored binary diffs
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instead of whole objects like rclone does, but that would break the
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1:1 mapping of files on your hard disk to objects in the remote cloud
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storage system.
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All the cloud storage systems support partial downloads of content, so
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it would be possible to make partial downloads work. However to make
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this work efficiently this would require storing a significant amount
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of metadata, which breaks the desired 1:1 mapping of files to objects.
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### Can rclone do bi-directional sync? ###
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No, not at present. rclone only does uni-directional sync from A ->
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B. It may do in the future though since it has all the primitives - it
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just requires writing the algorithm to do it.
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### Can I use rclone with an HTTP proxy? ###
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Yes. rclone will use the environment variables `HTTP_PROXY`,
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`HTTPS_PROXY` and `NO_PROXY`, similar to cURL and other programs.
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`HTTPS_PROXY` takes precedence over `HTTP_PROXY` for https requests.
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The environment values may be either a complete URL or a "host[:port]",
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in which case the "http" scheme is assumed.
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The `NO_PROXY` allows you to disable the proxy for specific hosts.
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Hosts must be comma separated, and can contain domains or parts.
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For instance "foo.com" also matches "bar.foo.com".
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### Rclone gives x509: failed to load system roots and no roots provided error ###
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This means that `rclone` can't file the SSL root certificates. Likely
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you are running `rclone` on a NAS with a cut-down Linux OS, or
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possibly on Solaris.
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Rclone (via the Go runtime) tries to load the root certificates from
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these places on Linux.
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"/etc/ssl/certs/ca-certificates.crt", // Debian/Ubuntu/Gentoo etc.
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"/etc/pki/tls/certs/ca-bundle.crt", // Fedora/RHEL
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"/etc/ssl/ca-bundle.pem", // OpenSUSE
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"/etc/pki/tls/cacert.pem", // OpenELEC
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So doing something like this should fix the problem. It also sets the
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time which is important for SSL to work properly.
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```
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mkdir -p /etc/ssl/certs/
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curl -o /etc/ssl/certs/ca-certificates.crt https://raw.githubusercontent.com/bagder/ca-bundle/master/ca-bundle.crt
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ntpclient -s -h pool.ntp.org
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```
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The two environment variables `SSL_CERT_FILE` and `SSL_CERT_DIR`, mentioned in the [x509 pacakge](https://godoc.org/crypto/x509),
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provide an additional way to provide the SSL root certificates.
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Note that you may need to add the `--insecure` option to the `curl` command line if it doesn't work without.
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```
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curl --insecure -o /etc/ssl/certs/ca-certificates.crt https://raw.githubusercontent.com/bagder/ca-bundle/master/ca-bundle.crt
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```
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### Rclone gives Failed to load config file: function not implemented error ###
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Likely this means that you are running rclone on Linux version not
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supported by the go runtime, ie earlier than version 2.6.23.
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See the [system requirements section in the go install
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docs](https://golang.org/doc/install) for full details.
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### All my uploaded docx/xlsx/pptx files appear as archive/zip ###
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This is caused by uploading these files from a Windows computer which
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hasn't got the Microsoft Office suite installed. The easiest way to
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fix is to install the Word viewer and the Microsoft Office
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Compatibility Pack for Word, Excel, and PowerPoint 2007 and later
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versions' file formats
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### tcp lookup some.domain.com no such host ###
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This happens when rclone cannot resolve a domain. Please check that
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your DNS setup is generally working, e.g.
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```
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# both should print a long list of possible IP addresses
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dig www.googleapis.com # resolve using your default DNS
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dig www.googleapis.com @8.8.8.8 # resolve with Google's DNS server
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```
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If you are using `systemd-resolved` (default on Arch Linux), ensure it
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is at version 233 or higher. Previous releases contain a bug which
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causes not all domains to be resolved properly.
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Additionally with the `GODEBUG=netdns=` environment variable the Go
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resolver decision can be influenced. This also allows to resolve certain
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issues with DNS resolution. See the [name resolution section in the go docs](https://golang.org/pkg/net/#hdr-Name_Resolution).
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