According to my understanding of strace, elasticsearch tries to use mktemp -t <template>. However, Alpine includes the BusyBox version of mktemp, which expects <template> to end with XXXXXX, unlike the GNU version of mktemp. Thus, generating the invalid argument error.

Issue correlates with the following PR: elastic/elasticsearch#27659, introduced in the 6.2.0 release.

Busybox

mktemp --help
BusyBox v1.27.2 (2017-12-12 10:41:50 GMT) multi-call binary.

Usage: mktemp [-dt] [-p DIR] [TEMPLATE]

Create a temporary file with name based on TEMPLATE and print its name.
TEMPLATE must end with XXXXXX (e.g. [/dir/]nameXXXXXX).
Without TEMPLATE, -t tmp.XXXXXX is assumed.

	-d	Make directory, not file
	-q	Fail silently on errors
	-t	Prepend base directory name to TEMPLATE
	-p DIR	Use DIR as a base directory (implies -t)
	-u	Do not create anything; print a name

Base directory is: -p DIR, else $TMPDIR, else /tmp

GNU

Usage: mktemp [OPTION]... [TEMPLATE]
Create a temporary file or directory, safely, and print its name.
TEMPLATE must contain at least 3 consecutive `X's in last component.
If TEMPLATE is not specified, use tmp.XXXXXXXXXX, and --tmpdir is implied.
Files are created u+rw, and directories u+rwx, minus umask restrictions.

  -d, --directory     create a directory, not a file
  -u, --dry-run       do not create anything; merely print a name (unsafe)
  -q, --quiet         suppress diagnostics about file/dir-creation failure
      --suffix=SUFF   append SUFF to TEMPLATE.  SUFF must not contain slash.
                        This option is implied if TEMPLATE does not end in X.
      --tmpdir[=DIR]  interpret TEMPLATE relative to DIR.  If DIR is not
                        specified, use $TMPDIR if set, else /tmp.  With
                        this option, TEMPLATE must not be an absolute name.
                        Unlike with -t, TEMPLATE may contain slashes, but
                        mktemp creates only the final component

  -p DIR              use DIR as a prefix; implies -t [deprecated]
  -t                  interpret TEMPLATE as a single file name component,
                        relative to a directory: $TMPDIR, if set; else the
                        directory specified via -p; else /tmp [deprecated]

      --help     display this help and exit
      --version  output version information and exit

Report mktemp bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report mktemp translation bugs to <http://translationproject.org/team/>
For complete documentation, run: info coreutils 'mktemp invocation'

6.2.1 fails with mktemp: Invalid argument #56

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