O_SYNC                           = 0x4010
	O_TMPFILE                        = 0x410000
	O_TRUNC                          = 0x200
	PARENB                           = 0x100
	PARODD                           = 0x200
	PENDIN                           = 0x4000
	PERF_EVENT_IOC_DISABLE           = 0x20002401
	PERF_EVENT_IOC_ENABLE            = 0x20002400
	PERF_EVENT_IOC_ID                = 0x40042407
	PERF_EVENT_IOC_MODIFY_ATTRIBUTES = 0x8004240b

	O_SYNC                           = 0x4010
	O_TMPFILE                        = 0x410000
	O_TRUNC                          = 0x200
	PARENB                           = 0x100
	PARODD                           = 0x200
	PENDIN                           = 0x4000
	PERF_EVENT_IOC_DISABLE           = 0x20002401
	PERF_EVENT_IOC_ENABLE            = 0x20002400
	PERF_EVENT_IOC_ID                = 0x40082407
	PERF_EVENT_IOC_MODIFY_ATTRIBUTES = 0x8008240b

		$2 ~ /^IX(ON|ANY|OFF)$/ ||
		$2 ~ /^IN(LCR|PCK)$/ ||
		$2 !~ "X86_CR3_PCID_NOFLUSH" &&
		$2 ~ /(^FLU?SH)|(FLU?SH$)/ ||
		$2 ~ /^C(LOCAL|READ|MSPAR|RTSCTS)$/ ||
		$2 == "BRKINT" ||
		$2 == "HUPCL" ||
		$2 == "PENDIN" ||
		$2 == "TOSTOP" ||
		$2 == "XCASE" ||
		$2 == "ALTWERASE" ||
		$2 == "NOKERNINFO" ||
		$2 == "NFDBITS" ||
		$2 ~ /^PAR/ ||
		$2 ~ /^SIG[^_]/ ||
		$2 ~ /^O[CNPFPL][A-Z]+[^_][A-Z]+$/ ||

	O_SYNC                           = 0x802000
	O_TMPFILE                        = 0x2010000
	O_TRUNC                          = 0x400
	PARENB                           = 0x100
	PARODD                           = 0x200
	PENDIN                           = 0x4000
	PERF_EVENT_IOC_DISABLE           = 0x20002401
	PERF_EVENT_IOC_ENABLE            = 0x20002400
	PERF_EVENT_IOC_ID                = 0x40082407
	PERF_EVENT_IOC_MODIFY_ATTRIBUTES = 0x8008240b

	O_SYNC                           = 0x101000
	O_TMPFILE                        = 0x404000
	O_TRUNC                          = 0x200
	PARENB                           = 0x1000
	PARODD                           = 0x2000
	PENDIN                           = 0x20000000
	PERF_EVENT_IOC_DISABLE           = 0x20002401
	PERF_EVENT_IOC_ENABLE            = 0x20002400
	PERF_EVENT_IOC_ID                = 0x40082407

	// CACertHashes specifies a set of public key pins to verify
	// when token-based discovery is used. The root CA found during discovery
	// must match one of these values. Specifying an empty set disables root CA
	// pinning, which can be unsafe. Each hash is specified as "<type>:<value>",
	// where the only currently supported type is "sha256". This is a hex-encoded
	// SHA-256 hash of the Subject Public Key Info (SPKI) object in DER-encoded

	O_SYNC                           = 0x101000
	O_TMPFILE                        = 0x404000
	O_TRUNC                          = 0x200
	PARENB                           = 0x1000
	PARODD                           = 0x2000
	PENDIN                           = 0x20000000
	PERF_EVENT_IOC_DISABLE           = 0x20002401
	PERF_EVENT_IOC_ENABLE            = 0x20002400
	PERF_EVENT_IOC_ID                = 0x40082407

	O_SYNC                           = 0x101000
	O_TMPFILE                        = 0x410000
	O_TRUNC                          = 0x200
	PARENB                           = 0x100
	PARODD                           = 0x200
	PENDIN                           = 0x4000
	PERF_EVENT_IOC_DISABLE           = 0x2401
	PERF_EVENT_IOC_ENABLE            = 0x2400
	PERF_EVENT_IOC_ID                = 0x80082407
	PERF_EVENT_IOC_MODIFY_ATTRIBUTES = 0x4008240b

	O_WRONLY                      = 0x1
	PARENB                        = 0x100
	PAREXT                        = 0x100000
	PARMRK                        = 0x8
	PARODD                        = 0x200
	PENDIN                        = 0x20000000
	PRIO_PGRP                     = 0x1
	PRIO_PROCESS                  = 0x0
	PRIO_USER                     = 0x2
	PROT_EXEC                     = 0x4
	PROT_NONE                     = 0x0

    echo "export ETCD_VERSION=3.0.17"
    echo
    echo "Alternatively, if you choose to allow an etcd upgrade that doesn't support downgrade,"
    echo "you might still be able to downgrade Kubernetes by pinning to the newer etcd version."
    echo "In all cases, it is strongly recommended to have an etcd backup before upgrading."
    echo
    if [ -t 0 ] && [ -t 1 ]; then